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 17011725 of 2,990

Dam NameHeight (ft)YearHazardCondition
Lost Calf Detention Dam

Carter County

311966LowUnsatisfactory
Lost Leg

Rosebud County

321968LowNot Rated
Loubren INCorporated #1

Toole County

301940LowNot Rated
Love

Custer County

311936LowNot Rated
Lower

Prairie County

291962LowNot Rated
Lower Baker Dam

Fallon County

231908HighSatisfactory
Lower Blacktail Reservoir

Rosebud County

201955LowNot Rated
Lower Dry Fork

Sanders County

371921HighFair
Lower Elliot Lake

Powell County

101924LowNot Available
Lower Glasston Dam

Sweet Grass County

301912HighPoor
Lower Indian Creek Reservoir

Big Horn County

151950SignificantNot Rated
Lower Taylor Dam

Powell County

21SignificantNot Rated
Lower Twin Lakes

Ravalli County

201916LowNot Available
Lower Two Medicine

Glacier County

701967HighSatisfactory
Lower Willow Creek Dam

Granite County

961962HighPoor
L Pawlowski #1

McCone County

131950LowNot Rated
L Pawlowski #3

McCone County

201960LowNot Rated
L Sayer-Magdalena

Roosevelt County

221959LowNot Rated
Lucas #1

Meagher County

281939LowNot Rated
Lucas #3

Meagher County

301941LowNot Rated
Lumberjack Junior

Chouteau County

201950LowNot Rated
L&V Rowten #1

Petroleum County

301963LowNot Rated
Lyle

Richland County

101954LowNot Rated
Lyle Nelson #1

McCone County

151969LowNot Rated
Lyle Nelson #3

McCone County

151949LowNot 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.