Oldest Dams in Washington

Washington has 809 dams with recorded construction dates. The oldest dates to 1888 — 138 years ago. Washington'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	Clear Lake Dam	Chelan	1888	138 yrs	13	High	Satisfactory
2	Clear Lake Saddle Dam	Chelan	1888	138 yrs	8	High	Satisfactory
3	Lily Lake Dam	Chelan	1892	134 yrs	14	High	Satisfactory
4	Macs Pond Dam	Kitsap	1895	131 yrs	39	Low
5	Snoqualmie Falls	King	1898	128 yrs	19	Low	Satisfactory
6	College Hill Reservoir	Grays Harbor	1899	127 yrs	31	High	Poor
7	Newcastle Railroad Embankment Dam	King	1900	126 yrs	55	High	Poor
8	Seattle City Volunteer Park Reservoir	King	1901	125 yrs	35	High	Satisfactory
9	Prosser Diversion Dam	Benton	1904	122 yrs	9	Low	Not Available
10	Morse Lake Overflow Dike	King	1904	122 yrs	30	Low
11	Mountain Lake Dam	San Juan	1905	121 yrs	17	High	Fair
12	Sheep Springs Dam	Adams	1906	120 yrs	30	Low
13	Three Lakes Reservoir Dam	Chelan	1908	118 yrs	9	Low
14	Nine Mile	Spokane	1908	118 yrs	87	High	Satisfactory
15	Roosevelt Reservoir	King	1910	116 yrs	23	High	Satisfactory
16	Little Falls Spillway Dam	Lincoln	1910	116 yrs	72	Low	Fair
17	Beaver Lake Dam	Okanogan	1910	116 yrs	10	Low
18	Sasse Reservoir Dam	Okanogan	1910	116 yrs	10	Low
19	Leader Lake Dam	Okanogan	1910	116 yrs	61	High	Satisfactory
20	Leader Lake Saddle Dam	Okanogan	1910	116 yrs	16	High	Satisfactory
21	Cranberry Lake Dam	Skagit	1910	116 yrs	13	High	Fair
22	Little Falls Dam	Stevens	1910	116 yrs	64	High	Fair
23	Bumping Lake Dam	Yakima	1910	116 yrs	61	High	Not Available
24	Conconully Dam	Okanogan	1911	115 yrs	72	High	Not Available
25	Tapps Lake Dike No 2a	Pierce	1911	115 yrs	9	High	Satisfactory
26	Tapps Lake Dike No10	Pierce	1911	115 yrs	18	High	Satisfactory
27	Tapps Lake Dike No 6	Pierce	1911	115 yrs	28	High	Satisfactory
28	Tapps Lake Dike No 9	Pierce	1911	115 yrs	15	High	Satisfactory
29	Tapps Lake Dike No 4	Pierce	1911	115 yrs	48	High	Satisfactory
30	Tapps Lake Dike No 12	Pierce	1911	115 yrs	14	High	Satisfactory
31	Tapps Lake Dike No 2b	Pierce	1911	115 yrs	15	High	Satisfactory
32	Tapps Lake Dike No 3	Pierce	1911	115 yrs	15	High	Satisfactory
33	Tapps Lake Dike No 5	Pierce	1911	115 yrs	28	High	Satisfactory
34	Tapps Lake Dike No 11	Pierce	1911	115 yrs	25	High	Satisfactory
35	Tapps Lake Dike No 8	Pierce	1911	115 yrs	20	High	Satisfactory
36	Tapps Lake Dike No 1	Pierce	1911	115 yrs	18	High	Satisfactory
37	Tapps Lake Dike No 13	Pierce	1911	115 yrs	5	High	Satisfactory
38	Tapps Lake Dike No 15	Pierce	1911	115 yrs	27	Low	Satisfactory
39	Tapps Lake Dike No 14	Pierce	1911	115 yrs	256	Low	Satisfactory
40	Wenas Dam	Yakima	1911	115 yrs	90	High	Fair
41	Wapato Lake Dam	Chelan	1912	114 yrs	40	High	Fair
42	Kachess Dam	Kittitas	1912	114 yrs	115	High	Not Available
43	Marshall Lake Dam	Pend Oreille	1912	114 yrs	10	High	Fair
44	Dagger Lake Dam	Snohomish	1912	114 yrs	10	Low
45	Antilon Lake Dam	Chelan	1913	113 yrs	62	High	Fair
46	Dragoon Lake Dam	Spokane	1913	113 yrs	18	Low
47	Masonry Dam	King	1914	112 yrs	230	High	Satisfactory
48	Schweitzer Dam And Reservoir	Okanogan	1914	112 yrs	18	High	Poor
49	Ione Mill Pond	Pend Oreille	1914	112 yrs	35	Low
50	Clear Creek Dam	Yakima	1914	112 yrs	84	High	Not Available

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