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 assessed
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 assessed
5	Beaverdam Pond	Baker	1902	124 yrs	11	Low	Not assessed
6	Ritter (large)	Klamath	1903	123 yrs	35	Low	Not assessed
7	Winchester	Douglas	1904	122 yrs	17	High	Poor
8	Mahon Reservoir	Harney	1904	122 yrs	31	Low	Not assessed
9	Bend Hydro (mirrorpond)	Deschutes	1905	121 yrs	18	Significant	Not assessed
10	Rimrock Lake	Harney	1905	121 yrs	13	Low	Not assessed
11	Hay Lake	Harney	1905	121 yrs	13	Low	Not assessed
12	North Canal Diversion	Deschutes	1906	120 yrs	35	High	Fair
13	Fred Creek Lake Dam	Wheeler	1906	120 yrs	25	Low	Not assessed
14	Faraday Forebay	Clackamas	1907	119 yrs	33	High	Satisfactory
15	Olive Lake	Grant	1907	119 yrs	39	High	Not assessed
16	Love Reservoir (malheur)	Malheur	1907	119 yrs	44	Significant	Not assessed
17	Killamacue Reservoir	Baker	1908	118 yrs	12	Significant	Not assessed
18	Elms Reservoir	Baker	1908	118 yrs	14	Low	Not assessed
19	Bennett Dam	Baker	1908	118 yrs	23	Low	Not assessed
20	Spaulding-vaughn Reservoir	Baker	1908	118 yrs	12	Low	Not assessed
21	Twin Lake-lower	Baker	1908	118 yrs	24	Low	Not assessed
22	Twin Lake-upper	Baker	1908	118 yrs	15	Low	Not assessed
23	Altnow Reservoir	Harney	1908	118 yrs	23	Low	Not assessed
24	Fish Lake Dam	Jackson	1908	118 yrs	50	High	Not assessed
25	Calderwood Reservoir	Lake	1908	118 yrs	15	Low	Not assessed
26	South Arm Reservoir	Lake	1908	118 yrs	19	Low	Not assessed
27	Big Swamp Reservoir	Lake	1908	118 yrs	10	Low	Not assessed
28	Cold Springs Dam	Umatilla	1908	118 yrs	115	High	Not assessed
29	Harpold Reservoir	Klamath	1909	117 yrs	60	Low	Not assessed
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 assessed
33	Withers Dam	Lake	1911	115 yrs	20	Low	Not assessed
34	Walterville Forebay	Lane	1911	115 yrs	24	High	Poor
35	Scott Dam	Malheur	1911	115 yrs	18	Low	Not assessed
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 assessed
40	Lost River Diversion Dam	Klamath	1912	114 yrs	42	Low	Not assessed
41	Somerville, the Reservoir	Malheur	1912	114 yrs	30	Low	Not assessed
42	Desert Meadows Reservoir Dam	Harney	1913	113 yrs	11	Low	Unsatisfactory
43	Three Mile Falls Diversion	Umatilla	1913	113 yrs	28	Low	Not assessed
44	Kinney Lake	Wallowa	1913	113 yrs	22	Low	Not assessed
45	Morfitt Reservoir	Baker	1914	112 yrs	20	Low	Not assessed
46	Drews	Lake	1914	112 yrs	63	High	Fair
47	Beer S Reservoir	Malheur	1914	112 yrs	14	Low	Not assessed
48	Mccoy Reservoir	Klamath	1915	111 yrs	24	Low	Not assessed
49	Simms Reservoir	Klamath	1915	111 yrs	15	Low	Not assessed
50	Thompson Valley Diversion (slid)	Lake	1915	111 yrs	48	Significant	Not assessed

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