1
Overcoming Construction Challenges:
The Dixboro Road Bridge Project
• “Old” bridges originally constructed 1921; widened 1969.
• Road Commission received notification from the MDOT of the Critical Bridge award in 1992.
• Preliminary corridor study initiated 1995; Environmental Assessment initiated 1997, completed 1999.
• Final design commenced 2000.
• Project bid January 2004. Low bid $9.6M, 2.2% over Engineers Estimate.
April 1947
December 1956
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Dixboro Road over Huron River: Pier 2Jet Grout Soil-Cement Testing Summary
0
200
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1800
2000
0 7 14 21 28 35Sample Age, days
Unc
onfin
ed C
ompr
essi
ve S
tren
gth,
ps
i
ws-Col.3-5.5'ws-Col.3-0.5'ws-Col.2-0.5'ws-Col.2-5.5'ws-Col.2-0.5'C2-1-aC2-1-bws-Col.1-spoilsws-Col.1-spoilsws-Col.18-1.0'ws-Col.10-0.5'ws-Col.10-0.0'ws-Col.23A-0.5'ws-Col.9-spoilsws-Col.23A-0.0'ws-Col.10-0.5'ws-Col.7-2.5ws-Col.7-0.5ws-Col.7-4.5ws-Col.6-2.0ws-Col.19-3.511/19 R2 P411/19 R3 P1ws-Col.3-4.5core-Col.5/10core-Col.5/10core-Col.2/3core-Col.2/3PP46861 updated 12/14/2004
Pier 2 Grout Strengths
0500
100015002000250030003500400045005000
11/05 11/06 11/07 11/08 11/09 11/10 11/11 11/12 11/13 11/14 11/15 11/16
Construction Date
Com
pres
sive
Str
engt
h, p
si
71428
Test Age, days
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