Lake Mead

Lake Powell

89%

61%

93%

71%

78%

52%, 12.62 MAF

42%, 10.86MAF

1,220’

3,700’

Current Elevation 3,609’

Colorado River Water Supply ReportSystem Contents: 29.05 MAF12/29/19

Current Elevation 1,090’

Mid-Elevation Release 3,575’

Tier 0 DCP 1,090’

Reservoir Current Change MaximumLake Mead 10.86 0.55 25.90Lake Powell 12.62 - 0.27 24.30Flaming Gorge Reservoir 3.33 - 0.06 3.75Navajo Reservoir 1.33 - 0.02 1.70Blue Mesa Reservoir 0.59 - 0.06 0.83Fontenelle Reservoir 0.21 - 0.03 0.34Morrow Point Reservoir 0.11 0.00 0.12

Reservoir Capacities (MAF)

As of 12/29/2019, snow accumulation in the Green River Basin (contributes ~33%) is at 6.9 in. (blue line), which is 114% of the 30-year median for this date of 6.0 in. (purple line) and is greater than last year’s amount (green line).

Snow accumulation in the Upper Colorado River Basin (contributes ~42%) to date is at 7.1 in., which is 118% of the 30-year median for this date of 6.0 in.

Snow accumulation in the San Juan River Basin (contributes ~13%) to date is at 10.9 in., which is 126% of the 30-year median for this date of 8.6 in.

For the overall Colorado River Basin above Lake Powell, the snow accumulation to date is at 7.3 in., which is 116% of the 30-year median for this date of 6.3 in.

Colorado River Basin Weather ModificationBasin-wide Weather Modification Agreement• Multi-party

Utah Division of Water Resources Six-Agency Committee of CaliforniaWyoming Water Development Office Southern Nevada Water AuthorityColorado Water Conservation Board Central Arizona Water Conservation DistrictNew Mexico Interstate Stream Commission

• Executed in 2018; effective through 2026• Included in Upper Basin DCP

Annual Process TimelineJune: Technical committee reviews annual exhibit of proposed activities

August: Activity exhibits are finalized and approved by technical committee

September: Final activity exhibits are executed

November: Weather modification activities begin

March/April: Weather modification activities end

Water Year 2020 Weather Modification Activities

Winter 2019-2020 Weather Modification programs:• Colorado

• Colorado Water Conservation Board

• Utah • Utah Division of Water Resources

• Wyoming • Wyoming Water Development Office

Description of Activities:• Extension of existing operations• Equipment placement and/or replacement (generators, icing meters)

• Optimization studies

Utah Weather Modification Activities (WY2020)

• Extension of High Uintas and Central/Southern Utah programs

• Operation and maintenance of icing rate meters

• Feasibility study to optimize cloud seeding in the High Uinta program

• High resolution weather forecast modeling (to guide seeding)

• Improve generator location placement in High Uintas

• Analysis and calibration of microwave radiometer data (to identify ideal seeding storm patterns, seedable clouds, and icing events)

High Uintas

Central/Southern Utah

Tributaries to Lake Powell

Tributaries to Lake Mead

Colorado Weather Modification Activities (WY2020)

• Extension of existing operations• Central Mountains River Basin• Grand Mesa• Gunnison River Basin• Telluride/Western Dolores• Western/Eastern San Juan Mountains

• Program equipment upgrades• Remote generators• Weather stations• Icing rate sensors• Radiometers

• Evaluation studies• Analysis of seeding condition trends from

radiometer data

Central Mountains

Gunnison

Grand Mesa

San Juan (West/East)

Telluride/San Miguel

Wyoming Weather Modification Activities (WY2020)

• Extension of existing operations in the Wind River Range• 10 remote generators (includes seeding material and meteorological forecasting)

Wind River Range

Predominant storm path direction

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Flaming Gorge Flaming Gorge ReservoirReservoir

Lake MeadLake Mead

Lake PowellLake Powell

Great Great Salt LakeSalt Lake

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COLORADOCOLORADO

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ARIZONAARIZONANEW MEXICONEW MEXICOCALIFORNIACALIFORNIA

OREGONOREGONNEBRASKANEBRASKA

SOUTH DAKOTASOUTH DAKOTA

TEXASTEXAS

OAKLAHOMAOAKLAHOMA

Green RiverGreen River

Rio

Gra

nd

e

Rio

Gra

nd

e

Yampa River

Yampa River

Virgin

Riv

er

Virgin

Riv

er

Arkansas River

Arkansas River

Big Sandy CreekBig Sandy Creek

Price River

Price River

San Juan RiverSan Juan River

Ha

ms Fo

rkH

am

s Fork

Pa

ria R

iver

Pa

ria R

iver

Bla

cks

Fork

Bla

cks

Fork

Duchesne River

Duchesne River

Salt R

iverSa

lt River

Do

lores R

iver

Do

lores R

iver

Uinta River

Uinta River

Fremont RiverFremont River

Escalante RiverEscalante River

San Rafael River

San Rafael River

Dirty D

evil River

Dirty D

evil River

Ash

ley Creek

Ash

ley Creek

Lake Fork River

Lake Fork River

Little Brush Creek

Little Brush Creek

Little Snake RiverLittle Snake River

Arkansas RiverArkansas River

Strawberry River

Strawberry River

Rio

Gra

nd

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Rio

Gra

nd

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Co

lora

do

Rive

rC

olo

rad

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iver

San

Ju

an

Riv

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San

Ju

an

Riv

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Rio GrandeRio Grande

Nye CountyNye County

Elko CountyElko County

Inyo CountyInyo County

Coconino CountyCoconino County

Lincoln CountyLincoln County

Harney CountyHarney County

Clark CountyClark County

Fremont CountyFremont County

Humboldt CountyHumboldt County

Sweetwater CountySweetwater County

Carbon CountyCarbon County

Malheur CountyMalheur County

Mohave CountyMohave County

Tooele CountyTooele County

Owyhee CountyOwyhee County

Whi te Pine CountyWhi te Pine County

Mil lard CountyMil lard County

San Juan CountySan Juan County

Apache CountyApache County

Box Elder CountyBox Elder County

Lander CountyLander County

Pershing CountyPershing County

Navajo CountyNavajo County

Natrona CountyNatrona County

Moffat CountyMoffat County

Rio Ar riba CountyRio Ar riba County

Garf ie ld CountyGarf ie ld County

Weld CountyWeld County

Tulare CountyTulare County

Kane CountyKane County

Emery CountyEmery County

Uintah CountyUintah County

Sublet te CountySublet te County

Albany CountyAlbany County

McKinley CountyMcKinley County

Churchil l CountyChurchil l County

Union CountyUnion County

Iron CountyIron County

Eureka CountyEureka County

Colfax CountyColfax County

Juab CountyJuab County

Grand CountyGrand County

Mesa CountyMesa County

San Miguel CountySan Miguel County

Las Animas CountyLas Animas County

Mineral CountyMineral County

Converse CountyConverse County

Sandoval CountySandoval County

Mono CountyMono County

Elmore CountyElmore County

Esmeralda CountyEsmeralda County

Gunnison CountyGunnison County

Kern CountyKern County

Quay CountyQuay County

Blaine CountyBlaine County

Duchesne CountyDuchesne County

Park CountyPark County

Taos CountyTaos County

Saguache CountySaguache County

Routt CountyRoutt County

Cassia CountyCassia County

Larimer CountyLarimer County

Fresno CountyFresno County

Beaver CountyBeaver County

Rio Blanco CountyRio Blanco CountyUtah CountyUtah County

Laramie CountyLaramie County

Wayne CountyWayne County

Pueblo CountyPueblo County

Uinta CountyUinta County

Plat te CountyPlat te County

Lyon CountyLyon County

Mora CountyMora County

Goshen CountyGoshen County

Yuma CountyYuma County

El Paso CountyEl Paso County

Harding CountyHarding County

Elber t CountyElber t County

Logan CountyLogan County

Teton CountyTeton CountyButte CountyButte County

Sev ier CountySev ier County

Washington CountyWashington County

Montrose CountyMontrose County

Niobrara CountyNiobrara County

Bent CountyBent County

Bingham CountyBingham County

Eagle CountyEagle County

San Bernardino CountySan Bernardino County

Summit CountySummit County

Santa Fe CountySanta Fe County

Caribou CountyCaribou County

Twin Falls CountyTwin Falls County

Montezuma CountyMontezuma County La Plata CountyLa Plata County

Bonnevil le CountyBonnevil le County

Jackson CountyJackson County

Power CountyPower County

Sanpete CountySanpete County

Guadalupe CountyGuadalupe County

Otero CountyOtero County

Huerfano CountyHuerfano County

Ada CountyAda County

Delta CountyDelta County

Adams CountyAdams County

Rich CountyRich County

Kit Carson CountyKit Carson County

Morgan CountyMorgan County

Kiowa CountyKiowa County

Cache CountyCache County

Cost i l la CountyCost i l la County

Conejos CountyConejos County

Oneida CountyOneida County

Archuleta CountyArchuleta County

Cibola CountyCibola County

Wasatch CountyWasatch County

Camas CountyCamas County

Pitk in CountyPitk in County

Bannock CountyBannock County

Dolores CountyDolores County

Boise CountyBoise County

Hinsdale CountyHinsdale County

Chaffee CountyChaffee County

Cheyenne CountyCheyenne County

Custer CountyCuster County

Baca CountyBaca County

Piute CountyPiute County

Bear Lake CountyBear Lake County

Douglas CountyDouglas County

Crowley CountyCrowley County

Boulder CountyBoulder County

Rio Grande CountyRio Grande County

Hot Spr ings CountyHot Spr ings County

Davis CountyDavis County

Jefferson CountyJefferson County

Arapahoe CountyArapahoe County

Daggett CountyDaggett County

Salt Lake CountySalt Lake County

Weber CountyWeber County

Gooding CountyGooding County

Alamosa CountyAlamosa County

Phil l ips CountyPhil l ips County

Teller CountyTeller County

Bernali l lo CountyBernali l lo County

Franklin CountyFranklin County

Ouray CountyOuray County

Canyon CountyCanyon County

Jerome CountyJerome County

Madera CountyMadera County

Sedgwick CountySedgwick County

Madison CountyMadison County

Torrance CountyTorrance County

Gem CountyGem CountyWashakie CountyWashakie County

Washoe CountyWashoe County

Lake CountyLake County

Minidoka CountyMinidoka County

Clear Creek CountyClear Creek County

Tuolumne CountyTuolumne County

Prowers CountyProwers County

Curry CountyCurry County

Payette CountyPayette County

Gilp in CountyGilp in County

Johnson CountyJohnson County

Storey CountyStorey County

Yavapai CountyYavapai County

Denver CountyDenver County

Grant CountyGrant County

Los A lamos CountyLos A lamos County

Mar iposa CountyMar iposa County

Debaca CountyDebaca County

Upper Colorado

River Basin

Cloud SeedingGenerator Locations

andTarget Areas

Legend#* Seeding Generator Locations

Rivers & StreamsMajor RiversSecondary RiversTertiary RiversWeather Modification Target AreasWater BodiesUpper Colorado River BasinLower Colorado River BasinState BoundariesCounty Boundaries

Data was digitized and interpolated from the following:Colorado River Basin Weather Modification / State of WyomingActivity Exhibit - 2018/19 Season -Wyoming Water DevelopmentOffice (WWDO) Utah Cloud Seeding Proposal 2018-2019 Utah Dept. Natural ResourcesColorado Cloud Seeding Proposal Water Year 2019 - ColoradoWater Conservation Board - Dept. Natural Resources.

30795_R2129_Weather_Mod_Sites RH 6/19/2018

G u lfo f

C a l i f ornia

Upper Colorado

River Basin

Lower Colorado

River Basin

UTNV

AZ

ID WY

NM

CO

TXMX

MT

CA

PA C I FIC O C E AN

OR

80 20 40 60 80 10010

Miles

Main Map Area of Detail

0 50 100 150 200Miles

³

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The data, symbology and representations depicted in this map are presented for reference only. No assumed quality of accuracy are determined and or implied. Map is subjected to revision and updateas is needed