Doctor'S Lake @ Mill Cove
Doctor'S Lake @ Mill Cove in Clay County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 2.1 ft visibility. Phosphorus: 86.5 µg/L.
- Clarity
- 2.1 ft
- Typical in August
- 86°F
- Type
- Eutrophic
- Trend
- → Stable
- Public access
- Yes
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Doctor'S Lake @ Mill Cove →
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Doctor'S Lake @ Mill Cove is a productive, nutrient-rich eutrophic lake in Clay County, Florida. Water quality is graded D based on 1 sampling years through 2024. Water clarity is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 16 other monitored lakes in Clay County, Doctor'S Lake @ Mill Cove ranks #12 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-09-17. Grade methodology: LakeQuality methodology.
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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)
Very murky, less than 2.1 ft of visibility. Phosphorus level: 86.5 µg/L. Trophic State Index: 67.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.1 ft | Not graded |
| Phosphorus | 86.5 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 67 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Doctor'S Lake @ Mill Cove
Compare lakeside cabins, hotels, and vacation rentals near Doctor'S Lake @ Mill Cove in Clay 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Doctor'S Lake @ Mill Cove are listed below.
Top-rated places to stay near Doctor'S Lake @ Mill Cove
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Water Temperature
Doctor'S Lake @ Mill Cove typically sits around 86°F at the surface in August. Summer average is about 86°F. Usually warmest in Jul (about 87°F) and coldest in Nov (about 68°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 32 field readings (2021–2024) via the EPA Water Quality Portal. See the full Doctor'S Lake @ Mill Cove water temperature breakdown →
Recreation & Access
- Lake Shore Public Boat RampPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Doctor'S Lake @ Mill Cove
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.019 m/yr | 6 |
| Phosphorus | ↓ Declining | +5.92 µg/L/yr | 6 |
EPA Impairment Status
Doctor'S Lake @ Mill Cove is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL2389 · Official waterbody report · Matched by proximity (1.15 km)
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Doctor'S Lake @ Mill Cove under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 1 facility has a reported Clean Water Act violation in the past three years.
- Fleming Island Regional WwtfOrange Park · 2.1 mi away · NPDES FL0043834MajorRecent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
County Ranking
Ranked #12 of 17 lakes in Clay County
Nearby Lakes in Clay County
Frequently asked questions about Doctor'S Lake @ Mill Cove
Where is Doctor'S Lake @ Mill Cove?
- Doctor'S Lake @ Mill Cove is a lake in Clay County, Florida. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Doctor'S Lake @ Mill Cove?
- Doctor'S Lake @ Mill Cove in Clay County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 2.1 ft visibility. Phosphorus: 86.5 µg/L.
Is Doctor'S Lake @ Mill Cove safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Doctor'S Lake @ Mill Cove has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
What is the water temperature of Doctor'S Lake @ Mill Cove?
- Doctor'S Lake @ Mill Cove typically sits around 86°F at the surface in August, from 32 EPA Water Quality Portal field readings (2021–2024). That is a typical value for the month, not a live reading.
Are there boat ramps on Doctor'S Lake @ Mill Cove?
- Doctor'S Lake @ Mill Cove has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Shore Public Boat Ramp. Public access is listed as yes.
Explore Doctor'S Lake @ Mill Cove across LakeQuality
Planning a trip around Castillo de San Marcos?
Doctor'S Lake @ Mill Cove is about 29 miles from Castillo de San Marcos National Monument. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Castillo de San Marcos →More Florida Lake Rankings
Other Grade D Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
46 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FL Dept. of Environmental Protection, Northeast District
21FLA_WQX46 samples · 2021–2024
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Named boat-access points from the USGS National Boat Ramps inventory