Where is Castaic Lake?

Castaic Lake is a lake in Los Angeles County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.

How deep is Castaic Lake?

Castaic Lake has a maximum depth of 330 feet. The lake covers 2008 acres.

Are there boat ramps on Castaic Lake?

Castaic Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Castaic Lake State Recreation Area (West). Public access is listed as yes.

Can I fish at Castaic Lake?

Castaic Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by California's fish and wildlife agency, so check its current regulations before you go.

Castaic Lake

Los Angeles County, California2,008 acresView map Directions

No nutrient or algae sampling on record from SWRCB for this lake.

Max depth

330 ft

Bathymetric survey

Area

2,008 acres

Surface area

Shoreline

28.8 mi

Measured length

Impaired · Mercury
330 ft max depth
Public access
Limited data

See the measurements Directions Where to stay

Castaic Lake in Los Angeles County, California has water-quality measurements published by SWRCB, shown here as reported. Maximum depth: 330 ft. Surface area: 2008 acres.

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Castaic Lake is a 2,008-acre lake in Los Angeles County, California with a maximum depth of 330 feet. Limited fish-species data available. Public access is available with 1 public boat landing.

Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.

What Castaic Lake is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp
Deep water330 ft surveyed max depth
Big water2,008 acres

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Castaic Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.

Whether Castaic Lake is safe to swim in today is a call for the California State Water Resources Control Board and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Castaic Lake

These are the measurements SWRCB publishes for Castaic Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

No clarity data.

Ask about Castaic Lake

Answers come straight from the public measurements and survey records on this page.

Lake Details

Max depth

330 ft

Surface area

2,008 acres

Shoreline

28.8 mi

Public access

Yes

Listed by SWRCB

Recreation & Access

Boat Landings

Yes

Public Access

Castaic Lake State Recreation Area (West)Public

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

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Stays near Castaic Lake

Compare lakeside cabins, hotels, and vacation rentals near Castaic Lake in Los Angeles County, California — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near Castaic Lake

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Fishing Castaic Lake

→ Castaic Lake fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Castaic Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Mercury

Designated uses not supporting: Fish consumption, Other.

Source: EPA ATTAINS assessment unit CAL4035100020091208105546 · Official waterbody report

Nearby Lakes in Los Angeles County

Castaic Lagoon2.6 miView →Elderberry Forebay2.5 miView →Dry Canyon Reservoir6.5 miView →Pyramid Lake12.4 miView →Bouquet Reservoir13.9 miView →Fairmont Reservoir15.7 miView →

Frequently asked questions about Castaic Lake

Where is Castaic Lake?: Castaic Lake is a lake in Los Angeles County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Castaic Lake?: Castaic Lake in Los Angeles County, California has water-quality measurements published by SWRCB, shown here as reported. Maximum depth: 330 ft. Surface area: 2008 acres.
Is Castaic Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Castaic Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Castaic Lake?: Castaic Lake has a maximum depth of 330 feet. The lake covers 2008 acres.
Are there boat ramps on Castaic Lake?: Castaic Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Castaic Lake State Recreation Area (West). Public access is listed as yes.
Can I fish at Castaic Lake?: Castaic Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by California's fish and wildlife agency, so check its current regulations before you go.