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Lewiston Orchards Project
Lewiston Orchards Project | Project History | Project Data | Contact Information

Project Data
Land Areas (1992)
Area Irrigated and Crop Value



Project # 336

Land Areas (1992)
Irrigable area:
Full Irrigation Service0 acres
Supplemental Service0 acres
Temporary Irrigation Service0 acres
Number of Irrigated Farms44
Residential, Commercial, Industrial Lands3,841 acres
Total Irrigable Lands3,841 acres


Population Served
Farm Population Served0
Non-Farm Population Served18,240
Total Population Served18,240


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


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Project Water Supply
Project Water Quality



Project Water Supply

Current Conditions

Weather Conditions (NOAA)


Clearwater River at Spalding, Idaho (USGS)

Streamflow Forecast Map

Spring and Summer (NRCS)

Snowpack Information

Mountain Snowpack Maps for Columbia River Basin
Columbia River Snowpack Summary

Drought Index

Palmer Drought Index Map
Explanation of Palmer Drought Severity Index (Text)

Historic Conditions

Annual Precipitation
Normal12.43 in
Maximum - 197115.44 in
Minimum - 19748.52 in
Lewiston, Idaho 1961-1990 


Mean Annual52.3 ?F
Daily Maximum - 08/04/1961115 ?F
Daily Minimum - 01/31/1950-22 ?F
Lewiston, Idaho 1948-1996 
Growing Season213 days
Elevation of irrigable area1,000 - 1,700 ft


Sweetwater and Webb Creeks
Drainage area at Lewiston52 sq mi
Estimated average annual discharge:16,500 acre-ft


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Project Water Quality


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Facilities in Operation
Storage Facilities
Regulatory Facilities
Diversion Facilities
Carriage Facilities
Pumping Plants



Facilities in Operation
Facilities in Operation
Storage Dams2
Diversion Dams4
Canals (irrigation)19 mi
Laterals (irrigation, pipeline)88 mi
Pumping Plants (irrigation)1
Domestic pipelines58 mi
Wells (domestic)1


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Storage Facilities

Reservoir `A` Dam

Soldiers Meadow Dam

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Regulatory Facilities

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Diversion Facilities
Webb Creek Diversion Dam
Type:Rockfill weir, concrete crest wall
LocationOn Webb Creek, about 15 miles south-east of Lewiston, Idaho.
Year Completed1948
Structural height20 ft
Hydraulic height10 ft
Crest length75 ft
Crest elevation3,599.0 ft
Volume1,300 cu yd
Headworks:30-in concrete pipe in 30-in concrete sluice pipe, controlled by 30-in intake and sluice gates, respectively
Diversion capacity20 cfs


Sweetwater Diversion Dam
Type:Rockfill weir, concrete crest wall
LocationOn Sweetwater Creek, about 12 miles southeast of Lewiston, Idaho.
Year Completed1948
Structural height12 ft
Hydraulic height8 ft
Crest length80 ft
Crest elevation (approximate)2,075.0 ft
Volume7,500 cu yd
Headworks:5- by 4-ft slide gate, concrete flume, and sand trap.
Diversion capacity77 cfs
Other Diversion Structures


Captain John Diversion Dam, at the head of Captain John Feeder Canal, supplements the water supply for Soldiers Meadow Reservoir. This dam was built by the Irrigation District in 1934, originally out of log cribs, but later replaced by a concrete structure. The dam is about 50 mi south of Lewiston, Idaho.

The diversion dam at the head of Lake Waha Feeder Canal was constructed by the Irrigation District in 1912 and replaced by a concrete structure about 1941. The dam is on the West Fork of Sweetwater Creek, about 23 mi southeast of Lewiston.

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Carriage Facilities
Webb Creek Diversion Conduit and Canal
LocationFrom Webb Creek Diversion Dam, about 15 miles southeast of Lewiston, Idaho, generally northwest to East Fork of Sweetwater Creek.
Construction periodWork by Reclamation consisted of replacing sections of deteriorated wooden flume with 7,800 ft of 30-in precast concrete pipe, and constructing about 500 ft of earth-lined canal in 1947-1948.
Length2.5 mi
Capacity20 cfs
Typical section, earth lined: 
Bottom width6 ft
Side slopes1.5:1
Water depth1.9 ft
Lining thickness6 in


Sweetwater Canal
LocationFrom Sweetwater Diversion Dam on Sweetwater Creek about 12 miles southeast of Lewiston, Idaho, generally north to Reservoir `A.`
Construction period1948-1949
Length9 mi
Capacity20 cfs
Typical section (flume): 
Bottom width5 ft
Water depth3.5 ft
Wall thickness6 in
Typical section (canal): 
Bottom width8 ft
Side slopes1.5:1
Water depth3.2 ft


Main Pipeline - Reservoir `A`
LocationFrom Reservoir `A` outlet works west to Lewiston Orchards distribution system.
Construction period1948-1949
Length4.4 mi
Description:4,450 ft of 36.5-in outside-diameter welded steel pipe to water treatment plant; 18,900 ft of 30.5-in pipe to end of line.

Irrigation Distribution System

In addition to 4.4 miles of large steel supply lines, 71.2 miles of pressure pipe ranging from 1 to 30 inches in diameter were installed by the Irrigation District totaling 12 miles.

Domestic Distribution System

The domestic distribution system consists of 47 miles of pipeline ranging in diameter from 9.75 to 14 in installed by Reclamation and 11 mi of extension installed by the Irrigation District.

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Pumping Plants


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Last updated: Oct 24, 2012