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 126150 of 2,990

Dam NameHeight (ft)YearHazardCondition
Weigand Reservoir

Blaine County

13HighNot Rated
Weeding #3

Garfield County

161962LowNot Rated
Weeding #2

Garfield County

141965LowNot Rated
Weeding #1

Garfield County

181950LowNot Rated
Webb #1

Cascade County

151962LowNot Rated
Weaver Dam

Fergus County

251966LowNot Rated
W C Eustance #1

Cascade County

141945LowNot Rated
Wb Goffena #1

Musselshell County

251955LowNot Rated
W B Black

Phillips County

101930LowNot Rated
Wayne #2

McCone County

141955LowNot Rated
Waukena Lake Dam

Beaverhead County

121930LowNot Available
Watts #1

Custer County

281912LowNot Rated
Watters #1

Powder River County

291966SignificantNot Rated
Watt #2

Garfield County

201960LowNot Rated
Watt

Garfield County

201966LowNot Rated
Watson #1

Rosebud County

151975LowNot Rated
Waters Dam #1

McCone County

241949LowNot Rated
Waters #5

McCone County

241907LowNot Rated
Waterman

Chouteau County

201945LowNot Rated
Warren Weaver #1

Fergus County

181964LowNot Rated
Waro Reservoir

Roosevelt County

201946LowNot Rated
Warmbrod

Roosevelt County

201945LowNot Rated
Ward Dam

Valley County

232003LowFair
Wapiti Dam

Phillips County

251984LowNot Rated
Wanken

Toole County

301928SignificantNot 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.