Island Park Dam

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Island Park Dam
Islandparkdam.jpg
Island Park Dam is located in Idaho
Island Park Dam
Location of Island Park Dam in Idaho
Location Fremont County, Idaho, near Island Park, Idaho
Coordinates 44°25′06.92″N 111°23′47.50″W / 44.4185889°N 111.3965278°W / 44.4185889; -111.3965278
ISLAND PARK DAM Latitude and Longitude:

44°25′06.92″N 111°23′47.50″W / 44.4185889°N 111.3965278°W / 44.4185889; -111.3965278
Construction began 1937
Opening date 1939
Operator(s) U.S. Bureau of Reclamation
Dam and spillways
Type of dam Zoned earthfill dam
Impounds Henrys Fork
Height 94 ft (29 m)
Length 9,500 ft (2,900 m)
Spillway type Ungated bathtub
Reservoir
Creates Island Park Reservoir
Total capacity 135,205 acre feet (0.166773 km3)
Catchment area 482 sq mi (1,250 km2) [1]

Island Park Dam is operated by the U.S. Bureau of Reclamation in Fremont County, Idaho. The dam lies in Targhee National Forest near Island Park. The zoned earthfill dam was built between 1937 and 1939 as part of the Minidoka Project, which provides water to irrigate farmland in Idaho's Snake River Plain. [1]

The dam provides only water storage, impounding 135,000 acre feet (0.167 km3), which is distributed by the Cross Cut Canal to farms in Fremont and Madison counties in Idaho, and Teton County in Wyoming. [1] The Island Park and Grassy Lake reservoirs were built as an alternative to construction of a larger project that would have flooded the Falls River area of Yellowstone National Park. [2] [3]

Climate

Island Park Dam, Idaho holds the record for the eighth-coldest temperature recorded in the United States (and the coldest temperature recorded in Idaho) at −60 °F (−51 °C).

Climate data for Island Park Dam, Idaho
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 49
(9)
55
(13)
62
(17)
76
(24)
84
(29)
91
(33)
97
(36)
96
(36)
91
(33)
82
(28)
68
(20)
56
(13)
97
(36)
Average high °F (°C) 26.5
(−3.1)
31.6
(−0.2)
38.5
(3.6)
48.4
(9.1)
59.8
(15.4)
68.8
(20.4)
79.0
(26.1)
78.5
(25.8)
68.7
(20.4)
54.9
(12.7)
37.2
(2.9)
27.6
(−2.4)
51.6
(10.9)
Average low °F (°C) 3.0
(−16.1)
4.8
(−15.1)
10.5
(−11.9)
21.5
(−5.8)
31.1
(−0.5)
37.7
(3.2)
42.9
(6.1)
40.7
(4.8)
32.8
(0.4)
25.1
(−3.8)
14.9
(−9.5)
5.6
(−14.7)
22.6
(−5.2)
Record low °F (°C) −60
(−51)
−47
(−44)
−36
(−38)
−18
(−28)
7
(−14)
20
(−7)
25
(−4)
17
(−8)
8
(−13)
−6
(−21)
−34
(−37)
−51
(−46)
−60
(−51)
Average precipitation inches (mm) 3.80
(96.5)
2.93
(74.4)
2.48
(63)
2.03
(51.6)
2.49
(63.2)
2.71
(68.8)
1.25
(31.8)
1.45
(36.8)
1.50
(38.1)
1.89
(48)
2.56
(65)
3.55
(90.2)
28.65
(727.7)
Average snowfall inches (cm) 48.6
(123.4)
37.5
(95.3)
29.3
(74.4)
13.9
(35.3)
4.1
(10.4)
0.4
(1)
0.0
(0)
0.1
(0.3)
1.0
(2.5)
6.6
(16.8)
25.3
(64.3)
47.9
(121.7)
214.8
(545.6)
Average precipitation days 15 12 11 9 10 10 6 7 6 7 10 13 116
Source: Western Regional Climate Center [4]

ISLAND PARK DAM INFORMATION

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