Ker Lake
Ker Lake in Marion County, Florida has a water quality grade of B (Good). Water clarity: 9.8 ft visibility. Phosphorus: 13.7 µg/L.
- Clarity
- 9.8 ft
- Typical in August
- 88°F
- Type
- Mesotrophic
- Trend
- → Stable
- Public access
- Yes
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Ker Lake is a mesotrophic lake in Marion County, Florida. Water quality is graded B based on 1 sampling years through 2025. Water clarity is declining over recent sampling years. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 17 other monitored lakes in Marion County, Ker Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-02-20. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLow algae
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)
Moderate clarity, visible to about 9.8 ft. Phosphorus level: 13.7 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.8 ft | Not graded |
| Phosphorus | 13.7 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Ker Lake
Compare lakeside cabins, hotels, and vacation rentals near Ker Lake in Marion 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 Ker Lake
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Planning a trip? Cabins and lodging at Ker Lake → · more Florida lake trips
Water Temperature
Ker Lake typically sits around 88°F at the surface in August. Summer average is about 87°F. Usually warmest in Aug (about 88°F) and coldest in Dec (about 62°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 62 field readings (2010–2025) via the EPA Water Quality Portal. See the full Ker Lake water temperature breakdown →
Recreation & Access
- Salt Springs Recreation Area Boat RampPublic
- Salt Springs Run Marina and LandingSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Public campgrounds near Ker Lake
- Salt Springs4.6 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Fishing Ker Lake
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.105 m/yr | 5 |
| Phosphorus | ↑ Improving | -5.1 µg/L/yr | 5 |
EPA Impairment Status
Ker Lake 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 FL2899B · Official waterbody report · Matched by proximity (0.61 km)
County Ranking
Ranked #6 of 18 lakes in Marion County
Nearby Lakes in Marion County
Frequently asked questions about Ker Lake
Where is Ker Lake?
- Ker Lake is a lake in Marion County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Ker Lake?
- Ker Lake in Marion County, Florida has a water quality grade of B (Good). Water clarity: 9.8 ft visibility. Phosphorus: 13.7 µg/L.
Is Ker Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Ker Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Ker Lake?
- Ker Lake typically sits around 88°F at the surface in August, from 62 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Are there boat ramps on Ker Lake?
- Ker Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Salt Springs Recreation Area Boat Ramp, Salt Springs Run Marina and Landing. Public access is listed as yes.
Are there campgrounds on Ker Lake?
- Ker Lake has 1 public campground from USGS The National Map within 5 km, including Salt Springs. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
Explore Ker Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Mesotrophic Lakes in Florida
Where this data comes from
82 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- St. Johns River Water Management District
21FLSJWM_WQX82 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
Named boat-access points from the USGS National Boat Ramps inventory
Public campgrounds from USGS The National Map Structures, within about 3 miles