Gap Lake
Gap Lake in Washington County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 13.8 ft visibility. Phosphorus: 4 µg/L.
- Clarity
- 13.8 ft
- Trend
- ↑ Improving
- Public access
- Yes
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Why Gap 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 Gap Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity and phosphorus, but not 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.
Gap Lake is a lake in Washington County, Florida. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2023-07-25. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Gap Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 13.8 ft. Phosphorus level: 4 µg/L. Trophic State Index: 32.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.8 ft | Not graded |
| Phosphorus | 4 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 32 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Gap Lake
Compare lakeside cabins, hotels, and vacation rentals near Gap Lake in Washington 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 Gap Lake
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Recreation & Access
- Griffin Landing (North)Public
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Gap Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.114 m/yr | 3 |
| Phosphorus | ↑ Improving | -0.29 µg/L/yr | 3 |
EPA Impairment Status
Gap 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 FL555 · Official waterbody report
Nearby Lakes in Washington County
Frequently asked questions about Gap Lake
Where is Gap Lake?
- Gap Lake is a lake in Washington County, Florida. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Gap Lake?
- Gap Lake in Washington County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 13.8 ft visibility. Phosphorus: 4 µg/L.
Is Gap Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Gap Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Gap Lake?
- Gap Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Griffin Landing (North). Public access is listed as yes.
Explore Gap Lake across LakeQuality
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Where this data comes from
4 measurements from 1 monitoring station, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples4 samples · 2020–2023
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