Bureau of Reclamation Banner
Central Utah Project - Vernal Unit
Vernal Unit (CUP) | Project History | Project Data | Contact Information

Project Data
Land Areas (1997)
Area Irrigated and Crop Value



Project # 325

Land Areas (1997)
Irrigable area:
Full Irrigation Service0 acres
Supplemental Service13,011 acres
Temporary Irrigation Service0 acres
Number of Irrigated Farms482
Residential, Commercial, Industrial Lands1,255 acres
Total Irrigable Lands14,781 acres


Population Served:
Farm Population Served1,930
Non-Farm Population Served10,040
Total Population Served11,970

Return to top

Area Irrigated and Crop Value
YearActual Area Irrigated (Acres)Crop Value (Dollars)

Return to top

Project Water Supply

Current Conditions


Green River near Jensen, Utah (USGS)
Streamflow Forecast Map

Spring and Summer (NRCS)
Snowpack Information

Mountain Snowpack Maps for Great Basin and California
Mountain Snowpack Maps for Colorado River Basin
Drought Index

Palmer Drought Index Map

Annual Precipitation
Normal8.24 in
Maximum - 198114.78 in
Minimum - 19742.81 in
Vernal, Utah 1961-1990 


Mean Annual45.1 ?F
Daily Maximum - 07/25/1931103 ?F
Daily Minimum - 01/09/1937-38 ?F
Vernal, Utah 1928-1996 
Growing Season119 days
Elevation of irrigable area4,820-5,700 ft


Ashley Creek
Drainage area at Fort Thornburgh Diversion Dam241 mi2
Annual discharge 
Maximum 142,300 acre-ft
Minimum 52,400 acre-ft
Average 92,800 acre-ft

Return to top

Project Water Quality

Ashley - Brush

Return to top

Facilities in Operation
Storage Dams1
Diversion Dams1
Canals15 mi
Drains20 mi

Return to top

Storage Facilities

Steinaker Dam

Return to top

Diversion Facilities
Fort Thornburgh Diversion.htm
Type:Rockfill overflow, embankment wings
LocationAshley Creek, Utah - Uintah Conservation District
Year Completed1961
Hydraulic height9 ft
Length1,564 ft
Weir crest length132 ft
Volume7,000 yd3
Diversion capacity710 cfs
Flood capacity3,400 cfs
Headworks capacity400 cfs

Return to top

Carriage Facilities
Steinaker Feeder Canal
Type:Concrete lined canal
LocationSteinaker Feeder Canal starts at Fort Thornburgh Diversion Dam and runs to Steinaker Reservoir
Construction period1961
Length3 mi
Diversion capacity400 cfs


Steinaker Service Canal
Type:Clay lined canal
LocationSteinaker Service Canal starts at Steinaker Reservoir and runs downstream through Ashley Valley
Construction period1962
Length12 mi
Diversion capacity300 cfs

Return to top

Last updated: Apr 21, 2011