HISTORIC U.S. 66 BRIDGE DATABASE 1926-1985

© 2015 Jim Ross

FOR NON-PROFIT USE ONLY

COMPILED BY JIM ROSS IN PREPARATION FOR THE BOOK: ROUTE 66 CROSSINGS: Historic Bridges of the Mother Road, published in 2016 by THE UNIVERSITY OF OKLAHOMA PRESS. It is recommended that the book be used as a companion to this database.

INTRODUCTION

Information in this database makes no claim to the final word on the bridges of Route 66, simply because it remains a work in progress. In addition to unresolved questions about early Route 66 alignments in some areas as well as dates that certain pathways were signed as US 66, the quest to ferret out build dates and bridge types for many of the lost structures continues. Along that thread, no attempt was made to verify which bridges original to the interstates carried Route 66 signage as the route was gradually dismantled, though the ones likely to have done so are addressed in the database. Some culverts that were too small to qualify as bridges but with historical significance were documented also, along with a few notable examples of structures integral to the roadway, such as railroad grade separations and tunnels.

To the extent records were available, state departments of transportation were the primary source used to verify bridge types and build dates. It was also necessary to use unofficial web-based resources and documents found in the literature, not all of which could be considered reliable. In some instances, build dates were estimated (circa) based on favored designs for a given era and other supporting evidence.

Bridges are listed using a separate document for each Route 66 state, while entries within each document follow an east-to-west geographical order. In addition to the numbered entries, there are notes providing anecdotal information or giving brief mention of structures not more fully documented.

Not all bridges that are listed on the National Register of Historic Places are so noted, though many are. Finally, with few exceptions, references to direction will be Eastbound or Westbound, regardless of the true direction of the road in a given instance. Unless otherwise attributed, all photos are by the author.

Key to abbreviations and acronyms:

EB = Eastbound

WB = Westbound

FAP = Federal Aid Project

LWC = Low-water Crossing

CALIFORNIA

NOTE: All of California 66 was decertified by 1976.

NOTE: Status of listed bridges is current as of 2014.

NOTE: Acknowledgment of a 1966 Steel Stringer bridge on I-40 over the 1947 route on the W. side ofthe Colorado River here: 34.717034,-114.491246

NOTE: CALTRANS bridge inventory shows that most I-40 bridges were built in 1967 and 1968. A fewaround Barstow were built between 1957 and 1961. One east of Needles was dated 1957. The ColoradoRiver Bridge was built in 1966. These bridges would have carried Route 66 traffic on sections where I-40was signed as US 66.

1. Steel Arch Bridge on the Colorado River (CA Side). Date Built: 1916; design engineer = J.A. Sourwine; built by Kansas City Structural Steel Co.Type: Three-hinge, spandrel-braced, Steel Through Arch; arch = 592’ Overall length = 832.’Status: Closed to traffic and converted in 1948 to carry a pipeline.Coordinates: 34.715327,-114.484707 Note: Added to the NRHP in 1988.

1994

2. Stone Arch Culvert over Workman Wash on upgrade 66 (former RR) near Park Moabi (Exit 153).Date Built: 1890 (built for RR; converted to 66 in 1947); widened at some point (W. side is Concrete)Type: Stone Arch Culvert; classified as a bridge by width of span (20’ + wide).Status: Open to trafficCoordinates: 34.724657,-114.493548

2013

NOTE: Five Mile Station Road is Exit 148. I-40 from this point to Needles was not likely signed as US 66.

3. RR Viaduct on Broadway in Needles.Date Built: 1965Type: 3-span Continuous Steel StringerStatus: Open to trafficCoordinates: 34.844537,-114.613262

2013

NOTE: Acknowledgment of the following inaccessible culvert ruin or LWC on the 1926 route W. of ParkRd. (W. of Needles) here: 34.874223,-114.654238

NOTE: Acknowledgment of a Culvert on the first paved route west of Needles here: 34.891645,-114.71245

NOTE: Assuming that I-40 was signed as US 66 between Needles and the US 95 turnoff to the west,there are 10 sets of interstate bridges on that segment (E to W), as follows:

34.856487,-114.630463 34.862368,-114.63862434.863327,-114.64008334.864965,-114.64243234.870458,-114.65058634.877112,-114.66047834.879383,-114.66384734.891405,-114.702289 (over RR)34.882903,-114.73364934.879286,-114.749967

NOTE: There are no bridges on the 1926 Goffs-to-Fenner Loop.

NOTE: I-40 bridges on the upgrade 66 / I-40 pathway between the US 95 Jct. west of Needles and theMountain Springs Rd. Exit (115) are as follows, E to W:

34.879515,-114.764204 34.877297,-114.80560734.847815,-114.96149734.843174,-114.97813134.83923,-114.9921920

NOTE: Between Exit 115 for Mtn. Springs Rd. and Ludlow, almost all of the bridges original to I-40 werebuilt from 1968-1970. Additonally, there are 24 sets of I-40 bridges between Ludlow and Barstow, mostof them built in 1967 and 1968. None of these are itemized. NOTE: Between Mountain Springs Rd. exit and the RR viaduct near Essex on the upgrade 2-lane 66there are 14 short timber bridges over unnamed washes (all built from 1929-1931) as follows:

4. 34.821581,-115.076107 5. 34.816155,-115.0890036. 34.811482,-115.099777. 34.803986,-115.1170388. 34.798039,-115.1307389. 34.789783,-115.14978710. 34.78662,-115.156965 11. 34.780082,-115.16914212. 34.776442,-115.1760313. 34.773129,-115.18218814. 34.769463,-115.18898515. 34.766285,-115.19489116. 34.76138,-115.20396317. 34.754399,-115.21769

18. RR Viaduct bridge between Mountain Springs Road Exit and Essex.Date Built: 1931 (from David Bricker, CALTRANS)Type: 5-span Concrete Deck Girder (No. 54C0328)Status: Open to trafficCoordinates: 34.753716,-115.220614

2013

NOTE: Between the RR viaduct above on the upgrade 2-lane 66 and Essex there are 4 additional timberbridges over unnamed washes (all built from 1929-1931) as follows:

19. 34.749256,-115.23103120. 34.745796,-115.23479721. 34.74055,-115.24017222. 34.736376,-115.244496

Between Essex and Ludlow on the 1926 + upgrade 2-lane route there are 97 additional short bridges oflike design. Photos include those at Chambless and at Amboy and a very long one approx. 5 mi. W. ofSiberia (#56, 72, and 102 below). Due to flooding in 2014, some of the timber bridges in the Mojave have been replaced and many others will be reconstructed or replaced during the coming years.

23. 34.728153,-115.25826124. 34.727355,-115.25991925. 34.718515,-115.272547 26. 34.715076,-115.27741227. 34.711592,-115.28232628. 34.706177,-115.28996529. 34.70189,-115.295978 30. 34.694997,-115.305693 31. 34.689281,-115.31376732. 34.682752,-115.3229433. 34.677185,-115.33079934. 34.668375,-115.34318535. 34.664463,-115.348665 36. 34.659788,-115.35512737. 34.654648,-115.36235838. 34.650897,-115.36765239. 34.64523,-115.37563540. 34.640023,-115.38294141. 34.63357,-115.3920542. 34.627196,-115.40097143. 34.617091,-115.41517644. 34.611268,-115.4233345. 34.605899,-115.43087846. 34.601846,-115.43657547. 34.594087,-115.44749648. 34.586646,-115.45788749. 34.583422,-115.462447

50. 34.578736,-115.46905151. 34.575772,-115.47318752. 34.573475,-115.476711 (3-span Concrete Slab replacement to original Timber Stringer)53. 34.56252,-115.50983154. 34.562269,-115.52382155. 34.562021,-115.5385956. 34.561849,-115.54809 (Six-span Timber Stringer with updated concrete curbs)57. 34.561476,-115.56915358. 34.561321,-115.57809859. 34.561166,-115.587529 60. 34.561038,-115.59414861. 34.560831,-115.60620262. 34.560519,-115.62348463. 34.560358,-115.632764 No. 56, at Chambless

64. 34.56004,-115.65068765. 34.559397,-115.68555366. 34.559216,-115.69516367. 34.559081,-115.70313568. 34.558916,-115.71193269. 34.558803,-115.71839670. 34.558646,-115.72637971. 34.558491,-115.734323 72. 34.558368,-115.740855 (Amboy) Single-span timber; build date unknown.73. 34.559653,-115.77202574. 34.561454,-115.77876275. 34.566147,-115.79644176. 34.567523,-115.80322477. 34.56884,-115.81003478. 34.569741,-115.81461579. 34.571042,-115.820972 No. 72, at Amboy

80. 34.572928,-115.82966381. 34.574887,-115.83883382. 34.576724,-115.84736883. 34.57766,-115.85176784. 34.578648,-115.85637585. 34.58026,-115.86384786. 34.581596,-115.870169 87. 34.584522,-115.8833588. 34.586657,-115.89246689. 34.588717,-115.901272

90. 34.589592,-115.90504391. 34.591235,-115.91207192. 34.59316,-115.92029493. 34.594701,-115.92648294. 34.596291,-115.9323495. 34.598137,-115.93912196. 34.600815,-115.94894397. 34.604148,-115.95958998. 34.610025,-115.96882999. 34.614094,-115.974507100. 34.618321,-115.980574101. 34.62517,-115.990407102. 34.63876,-116.008164 (Ten-span Timber with additional piers added; curbs dated 1952)103. 34.644802,-116.010792104. 34.650056,-116.013093105. 34.670797,-116.018984106. 34.695028,-116.053498107. 34.709129,-116.08701108. 34.711158,-116.092358109. 34.71301,-116.097237 No. 102, WB from Siberia

110. 34.714719,-116.101738111. 34.716048,-116.105257112. 34.716804,-116.107268113. 34.719227,-116.113641114. 34.724992,-116.125368115. 34.724882,-116.129523116. 34.724371,-116.145136117. 34.72423,-116.149106118. 34.724075,-116.153767119. 34.72361,-116.168096

NOTE: Between Lavic Rd. and Newberry Springs there are similar timber bridges here:120. 34.785039,-116.433624121. 34.78575,-116.441206122. 34.787153,-116.456071 (Just W. of Hector Rd.)123. 34.788616,-116.471614124. 34.796559,-116.51601125. 34.805816,-116.567557 126. 34.816272,-116.625957

NOTE: Between the I-40 crossover W. of Newberry Springs and Daggett on the upgrade alignment,there are 10 such bridges, as follows:

127. 34.848506,-116.809678128. 34.84877,-116.816104 (Single-span Timber; new wing walls and concrete supports) 129. 34.851116,-116.845244130. 34.852327,-116.8488131. 34.85341,-116.852041132. 34.85485,-116.8563133. 34.856694,-116.861739134. 34.859824,-116.871004135. 34.861069,-116.877988136. 34.861373,-116.88

NOTE: There are 0 bridges N. of the RR tracks (first pathway) between Newberry Springs and Daggett.

NOTE: There are two small concrete bridges on the Marine Corps Base at Barstow here: 136. 34.871122,-116.941068 137. 34.877535,-116.962773

138. Steel truss bridge on the Mojave River at Oro Grande / Victorville. Date Built: 1930; replaced a Parker Through Truss of unknown build date.Type: Modified Baltimore Truss with Concrete Deck Girder approaches (3-span on the E. end; 2-span on the W. end).Status: Open to trafficCoordinates: 34.573944,-117.322693

2013

NOTE: The bridge over the RR on the Mariposa Rd. alignment S. of Hesperia was built in 1967, one yearafter the interstate bridges: 34.391203,-117.408121

NOTE: Acknowledgment of a 1932 Concrete Culvert in middle Cajon Pass on the E. side of I-15 just N. ofExit 131 here: 34.31689,-117.478693. This is in the gully E. of the dirt road (hidden).

139. Concrete slab bridge on Brush Creek on Cajon Blvd. just S. of the Cleghorn Exit (129).Date Built: 1930Type: 3-span Concrete SlabStatus: Open to trafficCoordinates: 34.296156,-117.458042

2013

140. Zuni Creek Bridge .2 Mi. W. of the Brush Creek Bridge listed above.Date Built: 1952Type: Single-span Slab or Concrete Culvert (unable to obtain underside view).Status: Open to trafficCoordinates: 34.29328,-117.454516

2013

NOTE: Acknowledgment of structures in the canyon just E. of the Cleghorn Creek bridges located here:34.290275,-117.454545; and here: 34.29016,-117.454368

141. Slab bridge on Cleghorn Creek on the 4-lane expansion .2 mi. WB from Zuni Creek. Date Built: Date stamped 1952 Type: Single-span Concrete SlabStatus: Open to trafficCoordinates: 34.289413,-117.453016

2013 2013

142. Bridge on Cleghorn Creek next to the above bridge on the closed half of the 4-lane. Date Built: 1939Type: Concrete slabStatus: Closed to trafficCoordinates: 34.289424,-117.452793

2013

NOTE: Acknowledgment of concrete structures in the canyon opposite of the two bridges abovelocated here:34.289495,-117.45354734.289657,-117.454209

NOTE: Approximately 1/8th of a mile W. of the bridges above is a Concrete Culvert in the canyon here:34.286501, -117.453936

NOTE: About 2/10ths mi. W of the bridges listed above are two alignments side-by-side close to thecurrent highway downslope: The first is an old asphalt roadway along the current highway side of thetelephone poles here: 34.285999,-117.453465; the other a concrete roadway a bit farther downslope.

143. Twin bridges on 4-lane 66 on Cajon Blvd. approx. 1 mi. W. of above bridges.Date Built: 1952Type: Single-span Concrete SlabStatus: WB Closed to traffic; EB Open to trafficCoordinates: 34.277867,-117.452879

2013

NOTE: The single-span bridge on the drainage canal on Cajon Blvd. approx. 1 Mi. past the Jct. with PalmAve. appears to be post-66 era. 34.174275,-117.351688

144. RR Viaduct on Mt. Vernon in San Bernardino on the original route.Date Built: 1934; replaced an earlier viaduct with sharp turn.Type: Multi-span Steel Plate Girder with 3-span Concrete Slab on the S. end.Status: Open to trafficCoordinates: 34.105264,-117.313842

Ian Arthur Charles Bown photo 2013

NOTE: Acknowledgment of a lost bridge of unknown build date and type on 4th St. in San Bernardino on the original route. Current bridge is a Concrete Deck Girder built in 1973 (post-66 for this alignment):34.106436,-117.326748

145. East Branch Lytle Creek Bridge on 5th St. in San Bernardino on the upgrade route.Date Built: 1976 (the year 66 was decertified in CA); would have replaced earlier bridge.Type: 3-span, Continuous Concrete Deck Girder.Status: Open to trafficCoordinates: 34.107845,-117.329143

2013

146. Lytle Creek Channel Bridge on Foothill just W. of the entry above.Date Built: 1945Type: Single-span Concrete Deck GirderStatus: Open to trafficCoordinates: 34.106674,-117.332676

2013

147. Lytle Basin RR Viaduct on Foothill just W. of the entry above.Date Built: 1967Type: 5-span Continuous Concrete slabStatus: Open to trafficCoordinates: 34.106846,-117.340819

2013

Continuing W. on Foothill, other drainage structures with minimal significance are located here:34.106432,-117.54120234.106639,-117.57907234.106698,-117.6137534.106823,-117.69532734.108499,-117.75089734.111414,-117.75919334.121705,-117.78991234.124142,-117.80294 (built in 1928)34.136147,-117.83904734.128746,-117.843991

148. San Gabriel River Bridge on Huntington Dr. in Durate.Date Built: 1922 (North half); 1930 (South half) Respective dates are stamped on each side of the bridge.Type: 12-span Concrete Deck GirderStatus: Open to trafficCoordinates: 34.137187,-117.943305

Shiela Harlow photo (2013)

149. Bridge over Sawpit Wash at 801 Huntington in Monrovia.Date Built: 1952 (date stamp on curb); 1965 Geo marker on top rail; piers could be pre-1952. Type: Two-span Concrete Slab (No. 3131); would have replaced or updated an earlier structure.Status: Open to trafficCoordinates: 34.139863,-117.987788

2013

150. Bridge on Santa Anita Wash on Foothill Blvd. just W. of N. 2nd Ave.Date Built: 1928Type: Two-span Concrete Deck GirderStatus: Open to trafficCoordinates: 34.151024,-118.027725

2013

NOTE: The bridge over Baldwin Ave. on Colorado St. just W. of Santa Anita racetrack appears to be post-66 era: 34.148362,-118.050242

151. Colorado Street Bridge in Pasadena.Date Built: 1913 (year dedicated) for $240K; rededicated in 1993 after $27M rehab.Type: 9-span Open Spandrel Concrete Arch with 3-span Concrete Deck Girder at each end and one-span Concrete Slab on the W. end over Linda Vista Ave. (added at unknown later date).Status: Open to trafficCoordinates: 34.144656,-118.164216

Pasadena Museum of History 2013 Internet Satellite photo

152. RR Viaduct on Fair Oaks Dr. in Pasadena just S. of Glenarm St.Date Built: Unknown; route moved from Fair Oaks onto the Parkway in 1940. Type: Three-span Concrete Deck GirderStatus: Open to trafficCoordinates: 34.125006,-118.150227

2013

153. Bridge over Arroyo Seco Parkway on Fair Oaks Dr. in S. Pasadena.Date Built: 1940 (No. 53-0440), the same year the Fair Oaks route moved onto the Parkway.Type: 2-span Concrete SlabStatus: Open to trafficCoordinates: 34.119202,-118.150363Note: Parkway Alignment = 1940-1964 EB; 1944-1964 WB

2013

154. Arroyo Seco Parkway bridges over the Arroyo Seco Channel in S. Pasadena (Exit 31A).Date Built: 1939 (No. 53 0276)Type: 3-span Concrete SlabStatus: Open to traffic Coordinates: 34.118048,-118.167792 Note: This was the alignment from 1940-1964 EB; 1944-1964 WB.

2013

155. York Blvd. Bridge (Route 66 from 1931-1935) over the Arroyo Seco and the Parkway. Date Built: 1912 (No. 53 0121)Type: 6-span Closed Spandrel Concrete ArchStatus: Open to trafficCoordinates: 34.113016,-118.177234

2013

156. Bridge on San Fernando Rd. (1934-1936 construction alignment). Date Built: 1913Type: Single-span Closed Spandrel Concrete ArchStatus: Open to traffic Coordinates: 34.080384,-118.225031

2013

157. EB Arroyo Seco Parkway Bridge over the L.A. River (linked to tunnels).Date Built: 1936; completed 1937 (No. 53 0042R).Type: 8-span Steel and Concrete Girder (E. to W.: 5-span Concrete Deck Girder; 3-span Steel Girder). Status: Open to trafficCoordinates: 34.079903,-118.22656

California Highway & Public Works 2013

158. WB Arroyo Seco Pkwy. bridge over the L.A. River (elevated alongside tunnels).Date Built: 1944 (No. 53 0042L) Const. of the WB Pkwy. Began in 1941.Type: 8-span Steel and concrete girder (E. to W.: 5-span Concrete Deck Girder; 3-span Steel Girder).Status: Open to trafficCoordinates: 34.08013,-118.226672

2013

2013

159. Lost Figueroa St. Bridge over the L.A. River.

Date Built: 1939 (replaced two earlier bridges). Route moved here in 1931 or 1932. Type: Combination 6-span Concrete Girder (E. side approach), 1-span Steel Beam (over RR), and a Warren Deck Truss w/ Verticals (over the river).Status: Demolished in 2014Coordinates: 34.081293,-118.227187History: The 1903 Bridge was replaced in 1927 with a 4-ring, open spandrel concrete arch bridge (calledthe Dayton Ave. Bridge—street name later changed to Figueroa). A 1937 avalanche buries Riversideviaduct, taking more than a year to clear. In the interim, in 1938 flooding led to project to concrete theriverbed, requiring the 10-year old bridge to be replaced. The new bridge, replaced in 2014, opened in1939.

1927 bridge demo. City of L.A. Archives 1939 Figueroa St. Bridge (2013)

160. Hillside Viaduct between the former Figueroa St. Bridge and the EB Parkway. Date Built: 1931 (No. 53 2225G)Type: 21-span Continuous Concrete Deck GirderStatus: Open to traffic; today this road leads from the EB tunnels to the I-5 on-ramp, bypassing the connection with the former Figueroa St. Bridge.Coordinates: 34.080345,-118.227447

2013

161. Slab Bridge over the Figueroa St. off-ramp on the WB Arroyo Seco Parkway.Date Built: 1940 (No. 53 0533L)Type: Single-span Concrete SlabStatus: Open to trafficCoordinates: 34.082271,-118.223575

2013

162. Buena Vista Bridge on Broadway St. over the Los Angeles River.Date Built: 1913 (plaque says 1911); rehabbed in 1997 (plaque says 2000).Type: 7-span Open Spandrel Concrete Arch (E. to W.: 4 open spandrel and 3 closed spandrel spans).Status: Open to trafficCoordinates: 34.072103,-118.225106

2013

163. Elysian Park Tunnels (4) on Figueroa Street (later EB Arroyo Seco Parkway).Date Built: First three WB from river = 1931; 4th = 1936.Type: ConcreteStatus: Open to traffic, one-way EB (tunnels carried 2-way traffic until the WB Pkwy. opened in 1944).Coordinates: 34.077312,-118.229553 Note: Until the 4th tunnel opened, traffic turned S. at Solano to Broadway to continue into downtown.

2013 - Tunnels 1, 2, 3 - WB view Tunnel 4 - WB view

164. Arroyo Seco Parkway Bridge over Solano (just beyond Tunnel #3 WB).Date Built: 1942 (No. 53 0541L); upgraded in 2001.Type: 3-span Concrete Deck Girder (Tee Beam).Status: Open to trafficCoordinates: 34.075553,-118.232114

California Hwys. & Public Works 2013

NOTE: The Pedestrian Underpass (No. 53-0532R) beneath the Parkway at Solano was built in 1931 andwidened in 1942 for the expansion of the parkway to six lanes.

165. WB Parkway bridge over Amador St. (just WB from the Solano St. bridge above).Date Built: 1942 (No. 53-0504L); widened at some point for additional lanes; rehabbed in 2001.Type: Single-span Concrete slab Status: Open to trafficCoordinates: 34.074936,-118.232667

2013

166. Concrete Bridge over Stadium Way on the WB Arroyo Seco Pkwy. (W. of Tunnel No. 4).Date Built: 1942; Upgraded in 2001.Type: 3-span Continuous Concrete Deck GirderStatus: Open to trafficCoordinates: 34.071362,-118.235376

2013

167. Sunset Blvd. Bridge over Glendale Blvd. Date Built: 1934 (Replaced an earlier bridge with partitioned lanes.Type: Concrete Rigid FrameStatus: Open to trafficCoordinates: 34.078121,-118.260543

2013

168. Sunset Blvd. Bridge over Silver Lake Blvd.Date Built: 1934; likely rehabbed at some point.Type: Steel girder with arched brick pedestrian walkways underneath on each side.Status: Open to trafficCoordinates: 34.082601,-118.272846

2013

169. Bridge on Santa Monica Blvd. over the Hollywood 101 FreewayDate Built: 1949 (the date stamp on the S. side of bridge is presently concealed by traffic signs). Type: Concrete Slab; widened at some point. Status: Open to trafficCoordinates: 34.09079,-118.306506

2013

NOTE: Acknowledgment of the following bridges on the Hollywood (101) Freeway between the end ofthe Arroyo Seco Parkway Extension and Santa Monica Blvd., moving East to West:

34.062763,-118.248857 (1953 4-level interchange – EB ramp from 101 is a bridge over the parkway)34.064154,-118.250421 (N. Beaudry Ave.)34.069723,-118.261241 (Glendale Blvd.)34.072021,-118.266935 (N. Alvarado St.)34.074368,-118.27213 (N. Coronado St.)34.076558,-118.27919 (N. Vendome St.)34.077214,-118.281741 (Sliver Lake Blvd.)34.077814,-118.284431 (N. Hoover St.)34.078394,-118.286802 (N. Virgil Ave. - Pair of Twin Bridges)

34.082026,-118.295337 (N. Heliotrope St. - Pair of Twin Bridges)34.083588,-118.298862 (Melrose Lane - Pair of Twin Bridges) 34.084788,-118.300476 (North Normandie Ave.)

L.A. RIVER BRIDGES AND ALIGNMENT TIMELINE

1926-1931 Alignment: Huntington / Mission / Broadway to 7th St. downtown. NOTE: Part ofBroadwayremained 66 until 1935 (from Solano to downtown), when the fourth Elysian Park tunnelwas completed, and possibly into 1936 as part of the construction alignment. Also, until 1949 therewas a tunnel on Broadway just N. of Sunset Blvd.

1928: Figueroa St. Bridge. Then Dayton Avenue, the bridge had no curve. It replaced a 1903 bridge. In1937 an avalanche buried the Riverside Dr. elevated viaduct, which took more than a year to clear. Inthe meantime, flooding in 1938 led to a project to concrete the river, which meant the destruction ofthe 10 year old 1928 bridge. The new bridge, with the curve, opened in 1939. Construction began on itsreplacement in 2013.

Nov. 1931: First three tunnels opened for traffic (part of Figueroa St.). NOT 66 at this time.

1931-1934 Alignment: Fair Oaks, Mission, Arroyo, and York to Figueroa (then named Pasadena). Nearthe river, this route continued on the east side of the river on Pasadena to Broadway and the BuenaVista Bridge.

1934-1936: Construction Alignment (Probably signed TEMP 66): Shifted to the Colorado St. Bridgeand Colorado Blvd. to Eagle Rock to San Fernando along east side of river to Pasadena St. to Broadway,possibly while constructing the 1937 viaduct for the EB Parkway or other projects, such asimprovements to Figueroa St. near its northern end. Figueroa likely would have remained signedas US 66 throughout the construction period.

Aug. 4, 1936. Fourth tunnel opens. Route was shifted from Broadway prior to this (maybe in Jan. as CAused 1/1 effective dates at that time), using Solano to Broadway as a temp route after clearing TunnelNo. 3. The route shifted from the Broadway terminus at 7th St. downtown to the Sunset Blvd. route thesame year (1936).

1936-1940 Alignment: From Colorado St. Bridge onto Figueroa and through the 4 tunnels to Sunsetwhile the Arroyo Seco Parkway was completed, which opened in 1940. Coming off the Figueroa St.Bridge, motorists angled left up an incline via the hillside viaduct to enter the tunnels. Today this is theramp between EB Arroyo Seco and I-5.

1937: First (EB) Parkway river bridge (completed in 1936) opens, allowing EB traffic to bypass theFigueroa St. bridge and jog over to Figueroa just N. of viaduct. NOTE: This was the same year as theavalanche, blocking traffic to the new viaduct and tunnels from the Figueroa St. Bridge, which was alsoreplaced during this period. Once the new Figueroa St. Bridge opened in 1939, traffic resumed using it,along with the parkway bridge, to negotiate the Y at the tunnels. Once the parkway opened, thetunnels were no longer part of Figueroa St. 1940: Parkway opens from Pasadena to a connection with the 1937 (later EB) viaduct. At that pointtraffic bottlenecked and was two-way across the river through the tunnels to Sunset Blvd. Traffic alsofed in at this point from the new Figueroa St. Bridge via the hillside viaduct.

1941: Work begins on the Arroyo Seco Parkway “Extension,” which includes a WB bridge over the riverand WB roadway through Elysian Park to Sunset Blvd.

“By” 1942: Figueroa St. route becomes ALT 66 until 1964 (included the Colorado St. segment).

1943: December 30th – the WB viaduct opens and completes the Arroyo Seco Parkway as EB & WB fromPasadena to Sunset Blvd., eliminating the bottleneck and all two-way traffic. EB tunnel traffic can stillaccess Figueroa St. via the hillside viaduct or an exit-left offramp that goes under the WB parkway.

1953: Parkway is extended and route continues past Sunset to the Hollywood (101) Freeway, and fromthere to Santa Monica Blvd.