Oldest Dams in Montana

Montana has 2894 dams with recorded construction dates. The oldest dates to 1819 — 207 years ago. Montana's earliest dams were built in the 19th century, an era of westward expansion, irrigation development, and early water infrastructure. Older dams require particular attention for safety, as many were built before modern engineering standards.

#	Dam	County	Year Built	Age	Height (ft)	Hazard	Condition
1	Venus	Hill	1819	207 yrs	14	Low	Not assessed
2	Jupiter	Hill	1819	207 yrs	10	Low	Not assessed
3	Park Lake Dam	Jefferson	1872	154 yrs	31	High	Not assessed
4	Gipsy Lake Dam	Meagher	1872	154 yrs	9	Low	Not assessed
5	Potter (toole)	Toole	1880	146 yrs	12	Low	Not assessed
6	H S Dam	Richland	1885	141 yrs	18	Low	Not assessed
7	Jello	Carter	1886	140 yrs	20	Low	Not assessed
8	Bass Lake	Ravalli	1887	139 yrs	35	High	Not assessed
9	Ed Mcintyre	Toole	1889	137 yrs	15	Low	Not assessed
10	G N R R Dunkirk Reservoir	Toole	1889	137 yrs	14	Significant	Not assessed
11	Mclaren Dam	Blaine	1890	136 yrs	24	Low	Poor
12	Wesley #2	Prairie	1890	136 yrs	25	Low	Not assessed
13	Black Eagle	Cascade	1891	135 yrs	41	High	Poor
14	Canyon Lake	Ravalli	1891	135 yrs	21	High	Satisfactory
15	Big Creek Lake	Ravalli	1892	134 yrs	12	Significant	Not assessed
16	Mill Lake	Ravalli	1895	131 yrs	25	High	Not assessed
17	Basin Creek Dam #1	Silver Bow	1897	129 yrs	101	High	Satisfactory
18	Hearst Lake	Deer Lodge	1898	128 yrs	9	Low	Not assessed
19	Storm Lake Dam	Deer Lodge	1898	128 yrs	29	High	Poor
20	1120 Ice Reservoir Dam	Park	1898	128 yrs	25	Low	Not assessed
21	Mclean Dam (hill)	Hill	1899	127 yrs	25	Low	Not assessed
22	Curran-barrett #2	Lewis and Clark	1899	127 yrs	20	Low	Not assessed
23	Carlton Lake #1	Missoula	1899	127 yrs	22	High	Not assessed
24	Godfather	Chouteau	1900	126 yrs	30	Low	Not assessed
25	Fuddy Duddy	Chouteau	1900	126 yrs	12	Low	Not assessed
26	Georgetown Dam	Deer Lodge	1900	126 yrs	55	High	Satisfactory
27	Bayer #1	Granite	1900	126 yrs	10	Low	Not assessed
28	Kuntson #2	Hill	1900	126 yrs	20	Low	Not assessed
29	Deerborn Reservoir	Lewis and Clark	1900	126 yrs	20	Low	Not assessed
30	Rock Creek Lake Dam	Powell	1900	126 yrs	25	Low	Not assessed
31	Sears	Ravalli	1900	126 yrs	10	Low	Not assessed
32	Holloway Lake	Ravalli	1900	126 yrs	20	Low	Not assessed
33	German Reservoir	Toole	1900	126 yrs	15	Low	Not assessed
34	Big (toole)	Toole	1900	126 yrs	12	Low	Not assessed
35	Him	Toole	1900	126 yrs	10	Low	Not assessed
36	Rocky Mountain High	Toole	1900	126 yrs	20	Low	Not assessed
37	Prescott	Hill	1901	125 yrs	38	Low	Not assessed
38	Cain Dam	Valley	1901	125 yrs	13	Low	Not assessed
39	Meyer's Dam	Deer Lodge	1902	124 yrs	25	Low	Not assessed
40	West Alkali Reservoir	Phillips	1902	124 yrs	25	Significant	Not assessed
41	Burnt Fork Dam	Ravalli	1902	124 yrs	42	High	Not assessed
42	Elloam Ass.reservoir	Blaine	1903	123 yrs	25	Low	Not assessed
43	Baba Blacksheep	Chouteau	1903	123 yrs	21	Low	Not assessed
44	Anchor Lake North Dam	Beaverhead	1904	122 yrs	12	Significant	Not assessed
45	Tub Lake Dam	Beaverhead	1904	122 yrs	13	Significant	Not assessed
46	Anchor South Dam	Beaverhead	1904	122 yrs	11	High	Satisfactory
47	Pear Lake Dam	Beaverhead	1904	122 yrs	19	High	Poor
48	Thornton Lake Dam	Deer Lodge	1904	122 yrs	11	Significant	Not assessed
49	Melcott	Toole	1904	122 yrs	10	Low	Not assessed
50	Berkholder Dam	Toole	1904	122 yrs	24	Low	Not assessed

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