Where is McCoy Flat Reservoir?

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

McCoy Flat Reservoir

Lassen County, California1,408 acresView map Directions

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

Area

1,408 acres

Surface area

See the measurements Directions Where to stay

McCoy Flat Reservoir in Lassen County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 1408 acres.

Loading map…

McCoy Flat Reservoir is a 1,408-acre lake in Lassen County, California.

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

What McCoy Flat Reservoir is good for

From access and monitoring records, not editorial picks.

Big water1,408 acres

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether McCoy Flat Reservoir 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.

Get alerts for McCoy Flat Reservoir →

Water quality measurements for McCoy Flat Reservoir

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

No clarity data. TSI undefined.

Ask about McCoy Flat Reservoir

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

Lake Details

Surface area

1,408 acres

No bathymetric survey has been published for McCoy Flat Reservoir, so its depth is not documented here.

Stays via Stay22

Stays near McCoy Flat Reservoir

Compare lakeside cabins, hotels, and vacation rentals near McCoy Flat Reservoir in Lassen 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 McCoy Flat Reservoir

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

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Follow McCoy Flat Reservoir’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing McCoy Flat Reservoir

→ McCoy Flat Reservoir fishing regulations (limits, seasons, special rules)

Nearby Lakes in Lassen County

Mud Lake3.8 miView →Hog Flat Reservoir3.6 miView →Feather Lake5.7 miView →Crater Lake—View →Mountain Meadows Reservoir—View →Silver Lake11.4 miView →

Frequently asked questions about McCoy Flat Reservoir

Where is McCoy Flat Reservoir?: McCoy Flat Reservoir is a lake in Lassen County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of McCoy Flat Reservoir?: McCoy Flat Reservoir in Lassen County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 1408 acres.
Is McCoy Flat Reservoir safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.