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 226250 of 2,990

Dam NameHeight (ft)YearHazardCondition
Upper Baker Dam

Fallon County

321975HighSatisfactory
U N Reservoir

Hill County

201940LowNot Rated
Underdal #2

Toole County

251938LowNot Rated
Underdal #1

Toole County

191963LowNot Rated
Umstead Reservoir

Fergus County

241948LowNot Rated
U.L.T. Detention Dam

Valley County

181966LowPoor
Ulmer Lake

Rosebud County

201953LowNot Rated
Ugly

Blaine County

151943LowNot Rated
Ucaliptus

Toole County

101950LowNot Rated
Tye

Chouteau County

201955LowNot Rated
Two Turtle Dam

Toole County

201960LowNot Rated
Two Forks Detention Dam

Valley County

241956LowPoor
Twodot

Wheatland County

311953LowNot Rated
Two Dollar Bill

Meagher County

151940LowNot Rated
Two D-4 Ranch

Carter County

201952LowNot Rated
Twitchell #1

Garfield County

241960LowNot Rated
Twin (Turtle)

Lake County

341932HighPoor
Twin Lakes

Teton County

151952LowNot Rated
Twin Forks (Dawson)

Dawson County

351961LowNot Rated
Twin Dam #2

Rosebud County

151959LowNot Rated
Twin Dam #1

Rosebud County

151959LowNot Rated
Twin Bridges Wastewater Lagoon Dam

Madison County

13HighNot Rated
Twelvemile Coulee

Chouteau County

201969LowNot Rated
Tuttle

Phillips County

81958LowNot Rated
Tutsch Reservoir

Fergus County

301939LowNot 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.