Where is Marsh Creek Reservoir?

Marsh Creek Reservoir is a lake in Contra Costa County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.

Marsh Creek Reservoir

Contra Costa County, California51 acresView map Directions

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

Area

51 acres

Surface area

Shoreline

2 mi

Measured length

Impaired · Mercury

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Marsh Creek Reservoir in Contra Costa County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 51 acres.

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Marsh Creek Reservoir is a 51-acre lake in Contra Costa County, California.

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

Swimming conditions

No reading

Not rated

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

Whether Marsh Creek 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.

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Water quality measurements for Marsh Creek Reservoir

These are the measurements SWRCB publishes for Marsh Creek 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 Marsh Creek Reservoir

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

Lake Details

Surface area

51 acres

Shoreline

2 mi

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

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Stays near Marsh Creek Reservoir

Compare lakeside cabins, hotels, and vacation rentals near Marsh Creek Reservoir in Contra Costa 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 Marsh Creek Reservoir

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Fishing Marsh Creek Reservoir

→ Marsh Creek Reservoir fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Marsh Creek Reservoir 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.

Source: EPA ATTAINS assessment unit CAL5430002219980814120535 · Official waterbody report

Nearby Lakes in Contra Costa County

Antioch Municipal Reservoir7.5 miView →Willow Lake7.1 miView →Contra Loma Reservoir4.1 ft clear8.1 miView →Clifton Court Forebay8.9 miView →Holland Tract South Pond11.3 miView →Holland Tract Middle Pond—View →

Frequently asked questions about Marsh Creek Reservoir

Where is Marsh Creek Reservoir?: Marsh Creek Reservoir is a lake in Contra Costa County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Marsh Creek Reservoir?: Marsh Creek Reservoir in Contra Costa County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 51 acres.
Is Marsh Creek Reservoir safe to swim in?: Nutrient and algae readings are not a swimming clearance. Marsh Creek Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.