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Lewiston Orchards Project - Main Page
Facilities in Operation
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Storage Dams |
2 |
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Diversion Dams |
4 |
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Canals (irrigation) |
19 mi |
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Laterals (irrigation, pipeline) |
88 mi |
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Pumping Plants (irrigation) |
1 |
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Domestic pipelines |
58 mi |
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Wells (domestic) |
1 |
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Storage Facilities
Reservoir "A" Dam
Soldiers Meadow Dam
Diversion Facilities
Webb Creek Diversion Dam
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Type: |
Rockfill weir, concrete crest wall |
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Location |
On Webb Creek, about 15 miles south-east of Lewiston, Idaho. |
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Year Completed |
1948 |
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Dimensions: |
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Structural height |
20 ft |
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Hydraulic height |
10 ft |
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Crest length |
75 ft |
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Crest elevation |
3,599.0 ft |
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Volume |
1,300 yd³ |
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Headworks: |
30-in concrete pipe in 30-in concrete sluice pipe, controlled by 30-in intake and sluice gates, respectively |
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Diversion capacity |
20 cfs |
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Sweetwater Diversion Dam
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Type: |
Rockfill weir, concrete crest wall. |
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Location |
On Sweetwater Creek, about 12 miles southeast of Lewiston, Idaho. |
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Year Completed |
1948 |
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Dimensions: |
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Structural height |
12 ft |
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Hydraulic height |
8 ft |
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Crest length |
80 ft |
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Crest elevation (approximate) |
2,075.0 ft |
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Volume |
7,500 yd3 |
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Headworks: |
5- by 4-ft slide gate, concrete flume, and sand trap. |
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Diversion capacity |
77 cfs |
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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 out of log cribs following a simple standard design. The dam is about 50 mi south of Lewiston, Idaho, and is still in use.
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.
Carriage Facilities
Webb Creek Diversion Conduit and Canal
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Location |
From Webb Creek Diversion Dam, about 15 miles southeast of Lewiston, Idaho, generally northwest to East Fork of Sweetwater Creek |
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Construction period |
Work 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. |
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Length |
2.5 mi |
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Capacity |
20 cfs |
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Typical section, earth lined: |
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Bottom width |
6 ft |
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Side slopes |
1.5:1 |
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Water depth |
1.9 ft |
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Lining thickness |
6 in |
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Sweetwater Canal
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Location |
From Sweetwater Diversion Dam on Sweetwater Creek about 12 miles southeast of Lewiston, Idaho, generally north to Reservoir "A." |
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Construction period |
1948-1949 |
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Length |
9 mi |
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Capacity |
20 cfs |
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Typical section (flume): |
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Bottom width |
5 ft |
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Water depth |
3.5 ft |
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Wall thickness |
6 in |
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Typical section (canal): |
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Bottom width |
8 ft |
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Side slopes |
1.5:1 |
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Water depth |
3.2 ft |
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Main Pipeline - Reservoir "A"
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Location |
From Reservoir "A" outlet works west to Lewiston Orchards distribution system. |
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Construction period |
1948-1949 |
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Length |
4.4 mi |
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Description: |
4,450 ft of 36.5-in outside-diameter enameled welded steel pipe to water treatment plant; 18,900 ft of 30.5-in pipe to end of line. |
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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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