Oldest Dams in Oregon

Oregon has 768 dams with recorded construction dates. The oldest dates to 1890 — 136 years ago. Oregon'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	Welch Reservoir (widman #2)	Baker	1890	136 yrs	12	Low	Not Rated
2	Portland #1 (mt.tabor)	Multnomah	1894	132 yrs	38	High	Satisfactory
3	Portland #3 (washington Park)	Multnomah	1894	132 yrs	53	High	Satisfactory
4	Heart Lake Or Deep Lake	Lake	1898	128 yrs	12	Low	Not Rated
5	Beaverdam Pond	Baker	1902	124 yrs	11	Low	Not Rated
6	Ritter (large)	Klamath	1903	123 yrs	35	Low	Not Rated
7	Winchester	Douglas	1904	122 yrs	17	High	Poor
8	Mahon Reservoir	Harney	1904	122 yrs	31	Low	Not Rated
9	Bend Hydro (mirrorpond)	Deschutes	1905	121 yrs	18	Significant	Not Rated
10	Rimrock Lake	Harney	1905	121 yrs	13	Low	Not Rated
11	Hay Lake	Harney	1905	121 yrs	13	Low	Not Rated
12	North Canal Diversion	Deschutes	1906	120 yrs	35	High	Fair
13	Fred Creek Lake Dam	Wheeler	1906	120 yrs	25	Low	Not Rated
14	Faraday Forebay	Clackamas	1907	119 yrs	33	High	Satisfactory
15	Olive Lake	Grant	1907	119 yrs	39	High	Not Rated
16	Love Reservoir (malheur)	Malheur	1907	119 yrs	44	Significant	Not Rated
17	Killamacue Reservoir	Baker	1908	118 yrs	12	Significant	Not Rated
18	Elms Reservoir	Baker	1908	118 yrs	14	Low	Not Rated
19	Bennett Dam	Baker	1908	118 yrs	23	Low	Not Rated
20	Spaulding-vaughn Reservoir	Baker	1908	118 yrs	12	Low	Not Rated
21	Twin Lake-lower	Baker	1908	118 yrs	24	Low	Not Rated
22	Twin Lake-upper	Baker	1908	118 yrs	15	Low	Not Rated
23	Altnow Reservoir	Harney	1908	118 yrs	23	Low	Not Rated
24	Fish Lake Dam	Jackson	1908	118 yrs	50	High	Not Available
25	Calderwood Reservoir	Lake	1908	118 yrs	15	Low	Not Rated
26	South Arm Reservoir	Lake	1908	118 yrs	19	Low	Not Rated
27	Big Swamp Reservoir	Lake	1908	118 yrs	10	Low	Not Rated
28	Cold Springs Dam	Umatilla	1908	118 yrs	115	High	Not Available
29	Harpold Reservoir	Klamath	1909	117 yrs	60	Low	Not Rated
30	River Mill	Clackamas	1911	115 yrs	85	High	Satisfactory
31	Prospect Forebay Dam	Jackson	1911	115 yrs	31	Significant	Satisfactory
32	Lyle Reservoir	Jefferson	1911	115 yrs	15	Low	Not Rated
33	Withers Dam	Lake	1911	115 yrs	20	Low	Not Rated
34	Walterville Forebay	Lane	1911	115 yrs	24	High	Poor
35	Scott Dam	Malheur	1911	115 yrs	18	Low	Not Rated
36	Morrison Dam	Malheur	1911	115 yrs	33	Low	Poor
37	Portland #6 (mt.tabor)	Multnomah	1911	115 yrs	28	High	Satisfactory
38	Portland #5 (mt.tabor)	Multnomah	1911	115 yrs	55	High	Satisfactory
39	Haskell Reservoir	Baker	1912	114 yrs	15	Low	Not Rated
40	Lost River Diversion Dam	Klamath	1912	114 yrs	42	Low	Not Available
41	Somerville, The Reservoir	Malheur	1912	114 yrs	30	Low	Not Rated
42	Desert Meadows Reservoir Dam	Harney	1913	113 yrs	11	Low	Unsatisfactory
43	Three Mile Falls Diversion	Umatilla	1913	113 yrs	28	Low	Not Available
44	Kinney Lake	Wallowa	1913	113 yrs	22	Low	Not Rated
45	Morfitt Reservoir	Baker	1914	112 yrs	20	Low	Not Rated
46	Drews	Lake	1914	112 yrs	63	High	Fair
47	Beer S Reservoir	Malheur	1914	112 yrs	14	Low	Not Rated
48	Mccoy Reservoir	Klamath	1915	111 yrs	24	Low	Not Rated
49	Simms Reservoir	Klamath	1915	111 yrs	15	Low	Not Rated
50	Thompson Valley Diversion (slid)	Lake	1915	111 yrs	48	Significant	Not Rated

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