Bay-Mill-Bayou Lake
Bay-Mill-Bayou Lake in Bay County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.5 ft visibility.
- Clarity
- 4.5 ft
- Typical in August
- 88°F
- Trend
- ↓ Declining
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Why Bay-Mill-Bayou 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 Bay-Mill-Bayou Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
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 FDEP and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Bay-Mill-Bayou Lake is a lake in Bay County, Florida. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-08-30. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedBacteria advisory
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Bay-Mill-Bayou Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 4.5 ft. Trophic State Index: 55.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Bay-Mill-Bayou Lake
Compare lakeside cabins, hotels, and vacation rentals near Bay-Mill-Bayou 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-Mill-Bayou Lake
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Water Temperature
Bay-Mill-Bayou Lake typically sits around 88°F at the surface in August. Summer average is about 87°F. Usually warmest in Jul (about 88°F) and coldest in Jan (about 58°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 163 field readings (2010–2025) via the EPA Water Quality Portal. See the full Bay-Mill-Bayou Lake water temperature breakdown →
Fishing Bay-Mill-Bayou Lake
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.197 m/yr | 6 |
EPA Impairment Status
Bay-Mill-Bayou Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL1061H · Official waterbody report · Matched by proximity (1.34 km)
Graded lakes near Bay-Mill-Bayou Lake
Bay-Mill-Bayou Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Bay County
Frequently asked questions about Bay-Mill-Bayou Lake
Where is Bay-Mill-Bayou Lake?
- Bay-Mill-Bayou Lake is a lake in Bay County, Florida. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Bay-Mill-Bayou Lake?
- Bay-Mill-Bayou Lake in Bay County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.5 ft visibility.
Is Bay-Mill-Bayou Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Bay-Mill-Bayou Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
What is the water temperature of Bay-Mill-Bayou Lake?
- Bay-Mill-Bayou Lake typically sits around 88°F at the surface in August, from 163 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Explore Bay-Mill-Bayou Lake across LakeQuality
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Where this data comes from
66 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples66 samples · 2020–2025
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
Impairment status from EPA ATTAINS 303(d) database