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

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