Copco Lake
Copco Lake in Siskiyou County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 994 acres.
- Area
- 994 acres
- Public access
- Yes
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Why Copco Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Copco Lake, no water-quality sampling on record for this lake.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Copco Lake is a 994-acre lake in Siskiyou County, California. 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, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Copco Lake water quality
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Copco Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Copco Lake
Compare lakeside cabins, hotels, and vacation rentals near Copco Lake 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 Copco Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 994 acres |
| Public Access | Yes |
No bathymetric survey has been published for Copco Lake, so its depth is not documented here.
Recreation & Access
- Copco Reservoir (Mallard Cove)Public
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Copco Lake
Nearby Lakes in Siskiyou County
Frequently asked questions about Copco Lake
Where is Copco Lake?
- Copco Lake is a lake in Siskiyou County, California. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Copco Lake?
- Copco Lake in Siskiyou County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 994 acres.
Is Copco Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Copco Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Copco Lake?
- Copco Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Copco Reservoir (Mallard Cove). Public access is listed as yes.
Explore Copco Lake across LakeQuality
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Where this data comes from
Measurements for Copco Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory