Bay-Marin Lake
Bay County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Bay-Marin Lake. Here is what has been measured.
- Oligotrophic
Bay-Marin Lake in Bay County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 10.5 ft visibility. Phosphorus: 8 µg/L.
Bay-Marin Lake is a cold, clear oligotrophic lake in Bay County, Florida. Water clarity is declining over recent sampling years. Compared to the 4 other monitored lakes in Bay County, Bay-Marin Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-01-29. Methodology: how these readings are compared.
If you are planning to stay, you can search lake houses and cabins around Bay-Marin Lake on Vrbo, or look for a hotel room near the lake on Booking.com or Expedia.
What Bay-Marin Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10.5 ft of visibility
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Bay-Marin Lake is safe to swim in today is a call for the Florida Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Bay-Marin Lake
These are the measurements Florida DEP publishes for Bay-Marin Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 10.5 ft. Phosphorus 8 µg/L. TSI 39.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 10.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 8µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 39 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Bay-Marin Lake
Answers come straight from the public measurements and survey records on this page.
Stays via Stay22
Stays near Bay-Marin Lake
Compare lakeside cabins, hotels, and vacation rentals near Bay-Marin Lake in Bay County, Florida — 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 Bay-Marin Lake
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.
Planning a whole trip? See where to stay at Florida’s top lakes →
Follow Bay-Marin Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Bay-Marin Lake
Water Quality Trend: Stable
Based on 5 years of monitoring (2020–2024).
Water clarity
Worsening5 years
Phosphorus
Improving-0.55 µg/L/yr5 years
Nearby Lakes in Bay County
Frequently asked questions about Bay-Marin Lake
Where is Bay-Marin Lake?
- Bay-Marin Lake is a lake in Bay County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Bay-Marin Lake?
- Bay-Marin Lake in Bay County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 10.5 ft visibility. Phosphorus: 8 µg/L.
Is Bay-Marin Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Bay-Marin Lake across LakeQuality
More lakes in Florida
Other Lakes in Florida
Oligotrophic Lakes in Florida
Where this data comes from
347 measurements from 3 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX347 samples · 2020–2025
Monitoring station identifiers (3)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.