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 18011825 of 2,990

Dam NameHeight (ft)YearHazardCondition
Harding 1

Custer County

261960LowNot Available
Harbaugh, D.

Garfield County

261947LowNot Rated
Harbaugh,C.

Garfield County

151939LowNot Rated
Harbaugh #3

Garfield County

201952LowNot Rated
Happy Jack #1

Garfield County

151950LowNot Rated
Hanson Reservoir Dam

Meagher County

131932SignificantNot Rated
Hanson (Phillips)

Phillips County

201954LowNot Rated
Hanson Creek Dam

Fergus County

721974HighSatisfactory
Hanson Coulee

Hill County

121930LowNot Rated
Hanson CO #5

Rosebud County

181949LowNot Rated
Hanson CO #12

Rosebud County

151954LowNot Rated
Hanson CO #11

Rosebud County

151962LowNot Rated
Hanson #1

Custer County

161949LowNot Rated
Hanson

Valley County

191965LowNot Rated
Hansen Lake Dam

Roosevelt County

121946LowNot Rated
Hansen (Blaine)

Blaine County

101950LowNot Rated
Hansen

Roosevelt County

151940LowNot Rated
Hannaland Reservoir

McCone County

201959LowNot Rated
Hannaland #1

McCone County

251944LowNot Rated
Hanley

Carter County

151936LowNot Rated
Hankins #1

Chouteau County

401950LowNot Rated
Hanford

Chouteau County

301962LowNot Rated
Hand #3

Phillips County

191954LowNot Rated
Hamster

Wibaux County

231950LowNot Rated
Hamms Detention Dam

Valley County

191957LowUnsatisfactory
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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.