Tallest Dams in Alaska

Alaska has 104 dams with recorded heights. The tallest is Fort Knox Tailings Dam at 350 feet. Taller dams impound more water and carry greater potential energy, which is why height is a key factor in hazard classification and inspection requirements.

#	Dam	County	Height (ft)	Type	Purpose	Hazard	Year
1	Fort Knox Tailings Dam	Fairbanks North Star Borough	350	Rockfill	Water Supply	Significant	1996
2	Blue Lake	City and Borough of Sitka	294	Arch	Hydroelectric	High	1961
3	Green Lake	City and Borough of Sitka	210	Arch	Hydroelectric	Significant	1982
4	Red Dog Tailings Main Dam	Northwest Arctic Borough	208	Rockfill	Tailings	High	1993
5	Terror Lake	Kodiak Island Borough	193	Rockfill	Hydroelectric	Low	1984
6	Salmon Creek	City and Borough of Juneau	175	Arch	Hydroelectric	High	1914
7	Swan Lake	Ketchikan Gateway Borough	174	Arch	Hydroelectric	High	1984
8	Bradley Lake Dam	Kenai Peninsula Borough	125	Rockfill	Hydroelectric	Low	1991
9	Lake Connell	Ketchikan Gateway Borough	96	Concrete	Water Supply	High	1953
10	Pogo R.t.p. Dam	Southeast Fairbanks Census Area	91	Rockfill	Flood Risk Reduction	High	2005
11	Red Dog Water Supply Dam	Northwest Arctic Borough	75	Rockfill	Water Supply	Significant	1989
12	Fort Knox Water Dam	Fairbanks North Star Borough	70	Earth	Water Supply	Low	1995
13	Bettinger Upper Reservoir Dam	Kodiak Island Borough	67	Rockfill	Water Supply	High	1968
14	Red Dog Tailings Back Dam	Northwest Arctic Borough	66	Earth	Other	High	2010
15	Bridge Creek Dam	Kenai Peninsula Borough	65	Earth	Water Supply	High	1975
16	Nixon Fork Tailings Dam	Yukon-Koyukuk Census Area	64	Earth	Tailings	Significant	1995
17	Lower Slate Lake Tailings Dam	City and Borough of Juneau	63	Rockfill	Tailings	Significant	2010
18	Moose Creek Dam - East Cutoff Dike	Fairbanks North Star Borough	60	Earth	Flood Risk Reduction	High	1979
19	Upper Silvis	Ketchikan Gateway Borough	60	Rockfill	Hydroelectric	Low	1968
20	Monashka Creek Dam	Kodiak Island Borough	58	Rockfill	Water Supply	Significant	1982
21	Eklutna Dam	Municipality of Anchorage	56	Earth	Hydroelectric	High	1965
22	Hess Creek Dam	Yukon-Koyukuk Census Area	56	Earth	Water Supply	Significant	1946
23	Solomon Gulch Spillway	Chugach Census Area	55	Rockfill	Hydroelectric	High	1981
24	Cooper Lake	Kenai Peninsula Borough	52	Earth	Hydroelectric	High	1959
25	Ship Creek Dam	Municipality of Anchorage	50	Gravity	Water Supply	High	1954
26	Two Bull Ridge Pond T5 Dam	Denali Borough	49	Earth	Other	Low	2000
27	Pillar Creek Dam No.1.a	Kodiak Island Borough	45	Earth	Water Supply	Significant	1969
28	Monashka Creek Dike	Kodiak Island Borough	45	Rockfill	Water Supply	Significant	1982
29	Crystal Lake	Petersburg Borough	43	Rockfill	Hydroelectric	High	1955
30	Shotgun Creek Div	Kodiak Island Borough	40	Rockfill	Hydroelectric	Low	1984
31	Whitman Lake	Ketchikan Gateway Borough	39		Hydroelectric	High	1927
32	Cabin Creek Dam	Petersburg Borough	38	Rockfill	Water Supply	Significant	1996
33	New Kake Dam	Prince of Wales-Hyder Census Area	38	Concrete	Water Supply	High	2007
34	Chester Lake	Prince of Wales-Hyder Census Area	35	Concrete	Water Supply	High	1986
35	Lowell Creek	Kenai Peninsula Borough	34	Rockfill	Flood Risk Reduction	High	1945
36	Ketchikan Lakes	Ketchikan Gateway Borough	34	Rockfill	Hydroelectric	High	1957
37	Red Dog Mine Water Diversion Dam	Northwest Arctic Borough	34	Rockfill	Flood Risk Reduction	Low	1991
38	Sand Pit Dam	City and Borough of Juneau	33	Earth	Debris Control	Low	2016
39	A F K Hatchery Dam	Chugach Census Area	32	Concrete	Water Supply	Low	1977
40	Lower Silvis	Ketchikan Gateway Borough	32	Rockfill	Hydroelectric	Low	1954
41	Bart Lake Dam	City and Borough of Juneau	31	Rockfill	Hydroelectric	Low	2009
42	Carlanna Lake	Ketchikan Gateway Borough	31	Buttress	Water Supply	High	1975
43	Pond 7 Dam	City and Borough of Juneau	30	Rockfill	Flood Risk Reduction	Significant	2005
44	Long Lake Dam	City and Borough of Juneau	30	Concrete	Hydroelectric	Low	1973
45	Grant Mine Tailings Dam	Fairbanks North Star Borough	30		Tailings	Significant	1987
46	Dewey Forebay	Municipality of Skagway	30	Timber Crib	Hydroelectric	Low	1905
47	Wrangell Upper	City and Borough of Wrangell	28	Rockfill	Water Supply	High	1967
48	Wrangell Lower	City and Borough of Wrangell	28	Rockfill	Water Supply	High	1968
49	Lower Dewey	Municipality of Skagway	28	Timber Crib	Hydroelectric	Low	1905
50	Ward Cove Cannery Dam	Ketchikan Gateway Borough	27	Timber Crib	Water Supply	Low	1932

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