Lakes / Washington / Largest Lakes in Washington

Largest Lakes in Washington

Ranked by surface area, from Washington DFW lake data. Flowages and reservoirs count here - size is size - and each is labeled in its own record.

#	Lake	County	Surface Area	Max Depth
1	Franklin D Roosevelt Lake	Ferry	71,323 acres	-
2	Lake Umatilla	Klickitat	50,042 acres	-
3	Lake Chelan	Chelan	32,677 acres	About 1,500 ft
4	Banks Lake	Grant	26,879 acres	-
5	Lake Wallula	Benton	26,343 acres	-
6	Lake Washington	King	21,992 acres	-
7	Lake Bonneville	Skamania	19,452 acres	-
8	Wanapum Lake	Grant	14,362 acres	-
9	Potholes Reservoir	Grant	14,292 acres	-
10	Ross Lake	Whatcom	11,569 acres	-
11	Riffe Lake	Lewis	11,224 acres	-
12	Lake Celilo	Klickitat	8,750 acres	-
13	Lake Pateros	Douglas	8,376 acres	-
14	Rufus Woods Lake	Douglas	8,270 acres	-
15	Lake Sacajawea	Walla Walla	8,146 acres	-
16	Ozette Lake	Clallam	7,433 acres	About 320 ft
17	Lake Entiat	Douglas	7,171 acres	-
18	Moses Lake	Grant	6,716 acres	About 36 ft
19	Priest Rapids Lake	Yakima	6,387 acres	-
20	Spokane River Arm	Lincoln	6,303 acres	-
21	Lake Crescent	Clallam	5,022 acres	About 600 ft
22	Lake Whatcom	Whatcom	4,919 acres	-
23	Long Lake	Spokane	4,862 acres	-
24	Lake Sammamish	King	4,852 acres	-
25	Baker Lake	Whatcom	4,730 acres	-
26	Swift Reservoir	Skamania	4,586 acres	-
27	Cle Elum Lake	Kittitas	4,566 acres	-
28	Kachess Lake	Kittitas	4,388 acres	-
29	Lake Herbert G West	Walla Walla	4,273 acres	-
30	Lake Wallula	Benton	4,188 acres	-
31	Lake Cushman	Mason	4,015 acres	-
32	Lake Merwin	Clark	3,837 acres	-
33	Osoyoos Lake	Okanogan	3,706 acres	About 75 ft
34	Yale Lake	Cowlitz	3,595 acres	-
35	Lake Quinault	Grays Harbor	3,545 acres	-
36	Omak Lake	Okanogan	3,332 acres	-
37	Rock Island Pool	Chelan	3,281 acres	-
38	Alder Lake	Thurston	2,766 acres	-
39	Rimrock Lake	Yakima	2,547 acres	-
40	Spirit Lake	Skamania	2,535 acres	-
41	Lake Tapps	Pierce	2,444 acres	About 80 ft
42	Lake Wenatchee	Chelan	2,419 acres	About 240 ft
43	Keechelus Lake	Kittitas	2,409 acres	-
44	Vancouver Lake	Clark	2,287 acres	-
45	Sanpoil River Arm	Ferry	2,217 acres	-
46	Rock Lake	Whitman	2,190 acres	-
47	Osoyoos Lake	Okanogan	2,059 acres	About 75 ft
48	Palmer Lake	Okanogan	2,042 acres	About 70 ft
49	Mayfield Lake	Lewis	2,021 acres	-
50	Silver Lake	Cowlitz	1,989 acres	About 10 ft
51	Lake Wallula	Walla Walla	1,967 acres	-
52	Lake Shannon	Skagit	1,938 acres	-
53	Lake Entiat	Douglas	1,831 acres	-
54	Sprague Lake	Adams	1,760 acres	About 15 ft
55	Chester Morse Lake	King	1,743 acres	-
56	Spada Lake	Snohomish	1,687 acres	-
57	Lenore Lake	Grant	1,406 acres	-
58	Bumping Lake	Yakima	1,354 acres	About 89 ft
59	Sullivan Lake	Pend Oreille	1,296 acres	About 330 ft
60	Deer Lake	Stevens	1,146 acres	About 75 ft
61	Loon Lake	Stevens	1,093 acres	About 100 ft
62	American Lake	Pierce	1,092 acres	About 90 ft
63	Newman Lake	Spokane	1,091 acres	About 30 ft
64	South Fork Tolt Reservoir	King	1,011 acres	-
65	Lake Stevens	Snohomish	1,003 acres	About 155 ft
66	Wynoochee Lake	Grays Harbor	990 acres	-
67	Mason Lake	Mason	977 acres	About 90 ft
68	Billy Clapp Lake	Grant	973 acres	-
69	South Twin Lake	Ferry	965 acres	-
70	North Twin Lake	Ferry	876 acres	About 55 ft
71	Curlew Lake	Ferry	860 acres	About 120 ft
72	Soap Lake	Grant	844 acres	About 90 ft
73	Lake Cavanaugh	Skagit	833 acres	About 80 ft
74	Lake Samish	Whatcom	812 acres	-
75	Diablo Lake	Whatcom	790 acres	-
76	Howard A Hanson Reservoir	King	784 acres	-
77	Lake Union	King	757 acres	-
78	Diamond Lake	Pend Oreille	753 acres	About 55 ft
79	Coldwater Lake	Skamania	751 acres	-
80	Bead Lake	Pend Oreille	725 acres	-
81	Scooteney Reservoir	Franklin	711 acres	-
82	Liberty Lake	Spokane	706 acres	About 30 ft
83	Lake Youngs	King	685 acres	-
84	Eloika Lake	Spokane	630 acres	About 15 ft
85	Kettle River Arm	Ferry	589 acres	-
86	Saddle Mountain Lake	Grant	582 acres	-
87	Buffalo Lake	Okanogan	579 acres	-
88	Black Lake	Thurston	574 acres	About 28 ft
89	Skookumchuck Reservoir	Thurston	552 acres	-
90	Big Lake	Skagit	536 acres	-
91	Lake Goodwin	Snohomish	535 acres	About 50 ft
92	Blue Lake	Grant	534 acres	About 65 ft
93	Sylvan Lake	Lincoln	526 acres	-
94	Dickey Lake	Clallam	513 acres	-
95	Ross Lake	Whatcom	512 acres	-
96	Summit Lake	Thurston	512 acres	About 100 ft
97	Fish Lake	Chelan	503 acres	About 40 ft
98	Owhi Lake	Okanogan	499 acres	-
99	Lake Kapowsin	Pierce	496 acres	About 25 ft
100	Jameson Lake	Douglas	494 acres	About 55 ft

Showing the top 100 of 1,427 counted lakes. Search above, or browse by county on the Washington page, for the full inventory.

Source: Washington DFW lake data. Verified October 30, 2026. New lakes are added as their records are verified - rankings update with every addition.