Where is Lake Siskiyou?

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

How deep is Lake Siskiyou?

Lake Siskiyou has a maximum depth of 144 feet. The lake covers 434 acres.

Are there boat ramps on Lake Siskiyou?

Lake Siskiyou has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Sisiyou Camp-Resort, Inc..

Can I fish at Lake Siskiyou?

Lake Siskiyou 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.

Lake Siskiyou

Siskiyou County, California434 acresView map Directions

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

Max depth

144 ft

Bathymetric survey

Area

434 acres

Surface area

Shoreline

7.2 mi

Measured length

Impaired · Mercury
144 ft max depth
Limited data

See the measurements Directions Where to stay

Lake Siskiyou in Siskiyou County, California has water-quality measurements published by SWRCB, shown here as reported. Maximum depth: 144 ft. Surface area: 434 acres.

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Lake Siskiyou is a 434-acre lake in Siskiyou County, California with a maximum depth of 144 feet. 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 Lake Siskiyou is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp
Deep water144 ft surveyed max depth

Swimming conditions

No reading

Limited data

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

Whether Lake Siskiyou 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 Lake Siskiyou

These are the measurements SWRCB publishes for Lake Siskiyou, 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 Lake Siskiyou

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

Lake Details

Max depth

144 ft

Surface area

434 acres

Shoreline

7.2 mi

Recreation & Access

Boat Landings

Lake Sisiyou Camp-Resort, Inc.Semi-private

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

Stays via Stay22

Stays near Lake Siskiyou

Compare lakeside cabins, hotels, and vacation rentals near Lake Siskiyou in Siskiyou 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 Lake Siskiyou

Prices for Oct 16–18, 4 adults. Change dates on the map below.

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Follow Lake Siskiyou’s readings

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Fishing Lake Siskiyou

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

EPA Impairment Status

Lake Siskiyou 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 CAL5252202220020501142027 · Official waterbody report

Nearby Lakes in Siskiyou County

Castle Lake4.4 miView →Dwight Hammond Reservoir8.2 miView →Little Crater Lake7.7 miView →Toad Lake8.6 miView →Lake Shastina17 miView →Big Lake19.3 miView →

Frequently asked questions about Lake Siskiyou

Where is Lake Siskiyou?: Lake Siskiyou is a lake in Siskiyou County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Lake Siskiyou?: Lake Siskiyou in Siskiyou County, California has water-quality measurements published by SWRCB, shown here as reported. Maximum depth: 144 ft. Surface area: 434 acres.
Is Lake Siskiyou safe to swim in?: Nutrient and algae readings are not a swimming clearance. Lake Siskiyou is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Lake Siskiyou?: Lake Siskiyou has a maximum depth of 144 feet. The lake covers 434 acres.
Are there boat ramps on Lake Siskiyou?: Lake Siskiyou has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Sisiyou Camp-Resort, Inc..
Can I fish at Lake Siskiyou?: Lake Siskiyou 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.