Montana Dams

2,990 dams tracked by the National Inventory of Dams

Total Dams

2,990

High Hazard

188

6.3%

Poor / Unsatisfactory

132

Average Age

74 yrs

Hazard Classification

High188 (6.3%)
Significant193 (6.5%)
Low2,606 (87.2%)

Condition Assessment

Satisfactory113 (3.8%)
Fair44 (1.5%)
Poor / Unsatisfactory132 (4.4%)
Not Rated2,701 (90.3%)

Federal

278

State

151

Local

84

Private

2,466

All Dams in Montana

Showing 12261250 of 2,990

Dam NameHeight (ft)YearHazardCondition
H A Wyrick #1

Fallon County

151954LowNot Rated
Hay Creek Reservoir

Rosebud County

181940LowNot Rated
Haylodge #1

Hill County

301939LowNot Rated
Haylodge #2

Hill County

151940LowNot Rated
Haymaker Dam

Wheatland County

301978LowNot Rated
Haypense

Garfield County

121955LowNot Rated
Hays

Garfield County

181957LowNot Rated
Haystack

Blaine County

201940LowNot Rated
H C Brown #1

Big Horn County

201961LowNot Rated
Headman Dam

Petroleum County

30LowNot Rated
Heapby Reservoir

Deer Lodge County

151958LowNot Rated
Hearst Lake

Deer Lodge County

91898LowNot Rated
Hebgen Dam

Gallatin County

1201915HighSatisfactory
Heble

Fergus County

191954LowNot Rated
Heckmiller #1

Custer County

201955LowNot Rated
Hediger

Daniels County

261971LowNot Rated
Hedstorm Reservoir

McCone County

241936LowNot Rated
Heifer Pen

McCone County

241950LowNot Rated
Helena Valley Dam

Lewis and Clark County

941959HighNot Available
Helen B

Carter County

811966LowNot Rated
Helen B Dent Dam

Carter County

37LowSatisfactory
Hellinger

Toole County

101935SignificantNot Rated
Hell Roaring

Lake County

301916HighUnsatisfactory
Helluva

Fergus County

221956LowNot Rated
Hemund

Madison County

201974SignificantNot Rated
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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.