Lakes / California / Los Angeles County

Lakes in Los Angeles County, California

33 lakes counted in Los Angeles County - the largest is Castaic Lake at 2,008 acres.

Lakes Counted

2,008 acres

Largest - Castaic Lake

Los Angeles County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.

All Counted Lakes

#	Lake	County	Surface Area	Max Depth
1	Castaic Lake	Los Angeles	2,008 acres	-
2	Pyramid Lake	Los Angeles	1,177 acres	-
3	Bouquet Reservoir	Los Angeles	590 acres	-
4	San Gabriel Reservoir	Los Angeles	525 acres	-
5	Elderberry Forebay	Los Angeles	388 acres	-
6	Morris Reservoir	Los Angeles	284 acres	-
7	Quail Lake	Los Angeles	252 acres	-
8	Puddingstone Reservoir	Los Angeles	248 acres	-
9	Elizabeth Lake	Los Angeles	221 acres	-
10	Lake Palmdale	Los Angeles	214 acres	-
11	Castaic Lagoon	Los Angeles	165 acres	-
12	Fairmont Reservoir	Los Angeles	160 acres	-
13	Cogswell Reservoir	Los Angeles	145 acres	-
14	Stone Canyon Reservoir	Los Angeles	136 acres	-
15	Westlake Lake	Los Angeles	130 acres	-
16	Encino Reservoir	Los Angeles	113 acres	-
17	Piute Ponds	Los Angeles	109 acres	-
18	Little Rock Reservoir	Los Angeles	107 acres	-
19	Big Tujunga Reservoir	Los Angeles	89 acres	-
20	Hollywood Reservoir	Los Angeles	74 acres	-
21	Silver Lake Reservoir	Los Angeles	74 acres	-
22	Pond Two	Los Angeles	68 acres	-
23	Pacoima Reservoir	Los Angeles	61 acres	-
24	Kings Canyon Percolation Basin	Los Angeles	53 acres	-
25	Dry Canyon Reservoir	Los Angeles	46 acres	-
26	Legg Lake	Los Angeles	42 acres	-
27	Malibu Lake	Los Angeles	42 acres	-
28	Garvey Reservoir	Los Angeles	39 acres	-
29	San Dimas Reservoir	Los Angeles	35 acres	-
30	Harbor Lake	Los Angeles	34 acres	-
31	Hansen Flood Control Basin	Los Angeles	33 acres	-
32	Arnold Reservoir	Los Angeles	29 acres	-
33	Malibu Lagoon	Los Angeles	25 acres	-

Sources: USGS National Hydrography Dataset lake data; USGS. Verified October 30, 2026.