County Park Lake
County Park Lake in Lake County, California has a water quality grade of D (Nutrient-rich). Chlorophyll-a (algae): 14.4 µg/L.
- Type
- Eutrophic
- Public access
- Yes
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near County Park Lake →
County Park Lake is a productive, nutrient-rich eutrophic lake in Lake County, California. Water quality is graded D based on 1 sampling years through 2026. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 35 other monitored lakes in Lake County, County Park Lake ranks #26 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2026-06-24. Grade methodology: LakeGrade methodology.
Watch County Park Lake water quality
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Swimming Safety
Grade onlyElevated nutrients
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
No clarity data. Chlorophyll-a: 14.4 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 14.4 µg/L | Poor |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near County Park Lake
Compare lakeside cabins, hotels, and vacation rentals near County Park Lake in Lake 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around County Park Lake are listed below.
Top-rated places to stay near County Park Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Recreation & Access
- Clear Lake Lakeside County ParkPublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fishing County Park Lake
County Ranking
Ranked #26 of 36 lakes in Lake County
Nearby Lakes in Lake County
Frequently asked questions about County Park Lake
Where is County Park Lake?
- County Park Lake is a lake in Lake County, California. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for County Park Lake?
- County Park Lake in Lake County, California has a water quality grade of D (Nutrient-rich). Chlorophyll-a (algae): 14.4 µg/L.
Is County Park Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. County Park Lake has a water quality grade of D (Nutrient-rich). Algae concentration (chlorophyll-a) is 14.4 µg/L. Always check local health department advisories before swimming.
Are there boat ramps on County Park Lake?
- County Park Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Clear Lake Lakeside County Park. Public access is listed as yes.
Explore County Park Lake across LakeGrade
More California Lake Rankings
Other Grade D Lakes in California
Eutrophic Lakes in California
Where this data comes from
98 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Big Valley Band of Pomo Indians of the Big Valley Rancheria, California (Tribal)
CA_BVR98 samples · 2020–2026
Analytical methods
- Chlorophyll a
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory