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 10261050 of 2,606

Dam NameHeight (ft)YearHazardCondition
Hannaland #1

McCone County

251944LowNot Rated
Hannaland Reservoir

McCone County

201959LowNot Rated
Hansen

Roosevelt County

151940LowNot Rated
Hansen (Blaine)

Blaine County

101950LowNot Rated
Hansen Lake Dam

Roosevelt County

121946LowNot Rated
Hanson

Valley County

191965LowNot Rated
Hanson #1

Custer County

161949LowNot Rated
Hanson CO #11

Rosebud County

151962LowNot Rated
Hanson CO #12

Rosebud County

151954LowNot Rated
Hanson CO #5

Rosebud County

181949LowNot Rated
Hanson Coulee

Hill County

121930LowNot Rated
Hanson (Phillips)

Phillips County

201954LowNot Rated
Happy Jack #1

Garfield County

151950LowNot Rated
Harbaugh #3

Garfield County

201952LowNot Rated
Harbaugh,C.

Garfield County

151939LowNot Rated
Harbaugh, D.

Garfield County

261947LowNot Rated
Harding 1

Custer County

261960LowNot Available
Hardin Sewage Lagoon

Big Horn County

91962LowNot Rated
Hard Pan Detention Dam

Valley County

241954LowUnsatisfactory
Hard Rock Detention Dam

Valley County

241965LowPoor
Harfo

Richland County

251972LowNot Rated
Harkin

Carter County

151979LowNot Rated
Harlem Water Supply

Blaine County

81960LowNot Rated
Harlowton Sewage Lagoon

Wheatland County

101958LowNot Rated
Harmes Dam

Prairie County

20LowNot 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.