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 826850 of 2,990

Dam NameHeight (ft)YearHazardCondition
Ed Styer #4

Fergus County

201949LowNot Rated
Ed Styer #5

Fergus County

251930LowNot Rated
Edward Enterprises

Hill County

301978LowNot Rated
Edward Lanning #1

Carter County

201970LowNot Rated
Edward Lanning #2

Carter County

151960LowNot Rated
Edwards Reservoir

Garfield County

151956LowNot Rated
Eggebrecht Dam

Lake County

351977LowNot Rated
E Hardy #2

Custer County

201961LowNot Rated
E Hardy #4

Custer County

241974LowNot Rated
Ehret #1

Fallon County

301944LowNot Rated
Ehret Land Reservoir

Fallon County

121963LowNot Rated
Eide Trail

Toole County

151952LowNot Rated
Eightmile Spring

Chouteau County

151953LowNot Rated
Elder Elmer

Cascade County

361953LowNot Rated
Elderly Dam

Fergus County

401975SignificantNot Rated
Elias #1

Blaine County

151965LowNot Rated
Eliasson (Petroleum)

Petroleum County

191939LowNot Rated
E L Johnson #1

Rosebud County

301935LowNot Rated
Elloam Ass.Reservoir

Blaine County

251903LowNot Rated
Ellsworth

Valley County

151963LowNot Rated
Elroy

Richland County

151960LowNot Rated
Emma #1

Garfield County

141962LowNot Rated
Emmons #1

Powder River County

201955LowNot Rated
Engdahl #4

Garfield County

251950LowNot Rated
Engdahl #5

Garfield County

171940LowNot 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.