Clay-Ryan Lake
Clay-Ryan Lake in Clay County, Florida has a water quality grade of B (Good). Phosphorus: 23 µg/L. Surface area: 6 acres.
- Area
- 6 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Clay-Ryan Lake is a 6-acre mesotrophic lake in Clay County, Florida. Water quality is graded B based on 1 sampling years through 2022. Overall water quality 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, Clay-Ryan Lake ranks #10 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2022-07-26. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLimited data
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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
No clarity data. Phosphorus level: 23 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 23 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Clay-Ryan Lake
Compare lakeside cabins, hotels, and vacation rentals near Clay-Ryan Lake 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.
Top-rated places to stay near Clay-Ryan Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 6 acres |
| Public Access | Yes |
No bathymetric survey has been published for Clay-Ryan Lake, so its depth is not documented here.
Recreation & Access
- Middleburg (Main Street) Public Boat RampPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Clay-Ryan Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.875 m/yr | 3 |
| Phosphorus | ↑ Improving | -1.75 µg/L/yr | 3 |
Reservoir Info (USACE NID)
Clay-Ryan Lake is a man-made reservoir impounded by the Lake Ryan Dam (completed 1969), built primarily for recreation on the Tr-Black Creek; earth-type dam, 29 ft tall and 250 ft long.
- Surface area
- 6 ac
- Normal storage
- 42 ac-ft
- Max storage
- 81 ac-ft
- Drainage area
- 0 sq mi
- Hazard class
- High
- Owner
- LAKE ASBURY MUNICIPAL SERVICES BENEFIT DISTRICT (LAMSBD)
All listed purposes: Recreation;Other.
Source: USACE National Inventory of Dams, NID ID FL00151 · Operator website · Matched by proximity (0.12 km)
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Clay-Ryan Lake under Clean Water Act (NPDES) discharge permits.
- Middleburg Bluffs WwtfMiddleburg · 4.1 mi away · NPDES FL0113743
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 #10 of 17 lakes in Clay County
Nearby Lakes in Clay County
Frequently asked questions about Clay-Ryan Lake
Where is Clay-Ryan Lake?
- Clay-Ryan Lake is a lake in Clay County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Clay-Ryan Lake?
- Clay-Ryan Lake in Clay County, Florida has a water quality grade of B (Good). Phosphorus: 23 µg/L. Surface area: 6 acres.
Is Clay-Ryan Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Clay-Ryan Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
Are there boat ramps on Clay-Ryan Lake?
- Clay-Ryan Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Middleburg (Main Street) Public Boat Ramp. Public access is listed as yes.
Explore Clay-Ryan Lake across LakeQuality
Planning a trip around Castillo de San Marcos?
Clay-Ryan Lake is about 33 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 B Lakes in Florida
Mesotrophic Lakes in Florida
Where this data comes from
9 measurements from 3 monitoring stations, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX9 samples · 2022
Monitoring station identifiers (3)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Named boat-access points from the USGS National Boat Ramps inventory