Island Park Dam facts for kids
Quick facts for kids Island Park Dam |
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 Location of Island Park Dam in Idaho
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| 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 |
| 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) |
Island Park Dam is operated by the U.S. Bureau of Reclamation in Fremont County, Idaho, United States. 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.
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. 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.
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) |
| Mean daily maximum °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) |
| Mean daily minimum °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 (97) |
2.93 (74) |
2.48 (63) |
2.03 (52) |
2.49 (63) |
2.71 (69) |
1.25 (32) |
1.45 (37) |
1.50 (38) |
1.89 (48) |
2.56 (65) |
3.55 (90) |
28.65 (728) |
| Average snowfall inches (cm) | 48.6 (123) |
37.5 (95) |
29.3 (74) |
13.9 (35) |
4.1 (10) |
0.4 (1.0) |
0.0 (0.0) |
0.1 (0.25) |
1.0 (2.5) |
6.6 (17) |
25.3 (64) |
47.9 (122) |
214.8 (546) |
| Average precipitation days | 15 | 12 | 11 | 9 | 10 | 10 | 6 | 7 | 6 | 7 | 10 | 13 | 116 |
| Source: Western Regional Climate Center | |||||||||||||
