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

 

  

Project # 234

Land Areas (1992)
Irrigable area:
Full Irrigation Service4,117 acres
Supplemental Service0 acres
Temporary Irrigation Service0 acres
Number of Irrigated Farms41
Residential, Commercial, Industrial Lands750 acres
Total Irrigable Lands4,867 acres

 

Population Served:
Farm Population Served87
Non-Farm Population Served820
Total Population Served907

 

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Area Irrigated and Crop Value
YearActual Area Irrigated (Acres)Crop Value (Dollars)
19833,880790,638
19843,850979,399
19853,835944,898
19863,850926,180
19873,835782,559
19883,835896,673
19893,8351,016,695
19903,8351,053,052
19913,8351,053,052
19923,8351,053,052

 

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Project Water Supply
Project Water Quality

 

   

Project Water Supply

Current Conditions

Reservoir Storage



Streamflow

Clark Fork above Missoula, Montana (USGS)

Streamflow Forecast Map

Spring and Summer (NRCS)

Snowpack Information

Columbia River Snowpack Summary (NRCS)
Mountain Snowpack Maps for Colombia River Basin (NRCS)

Drought Index

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

 


Historic Conditions

Annual Precipitation
Normal13.46 in
Maximum - 198019.35 in
Minimum - 19739.01 in
Missoula, Montana 1961-1990 

 

Temperature
Mean Annual44.2 ?F
Daily Maximum - 07/12/1953105 ?F
Daily Minimum - 01/26/1957-33 ?F
Missoula, Montana 1948-1996 
Growing Season143 days
Elevation of irrigable area3,100 ft

 

Clark Fork River
Drainage area below Missoula, Montana.9,003 sq mi
Annual discharge: 
Maximum - 19755,977,303 acre-ft
Minimum - 19311,804,734 acre-ft
Average - 1929 - 19963,868,194 acre-ft

Streamflows: Clark Fork below Missoula, Montana (USGS)

 

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Project Water Quality

Middle Clark Fork

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

 

   

Facilities in Operation
Diversion Dams1
Canals17 mi
Laterals21 mi
  
  

 

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Storage Facilities

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Regulatory Facilities

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Diversion Facilities
Frenchtown Diversion Dam
TypeEarthfill and rockfill, non overflow
LocationOffstream on side channel of the Clark Fork River, about 6 miles west of Missoula, Montana.
Year Completed1936
Dimensions: 
Structural height16 ft
Hydraulic height13 ft
Crest length489 ft
Crest width15 ft
Crest elevation3,090.00
Volume12,000 cu yd
Headworks:Two 4-ft-square gates.
Diversion capacity172 cfs

 

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Carriage Facilities
Main Canal
LocationFrom Frenchtown Diversion Dam generally northwest along the Clark Fork River to vicinity of Huson, Montana.
Construction period1936-1937
Length17 mi
Diversion capacity172 cfs
Typical section in earth: 
Bottom width12 ft
Side slopes1.5:1
Water depth4.4 ft
Typical section, concrete lined: 
Bottom width6 ft
Side slopes1.5:1
Water depth3.7 ft
Lining thickness3 in

 

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Pumping Plants
  
  

 

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Last updated: Apr 21, 2011