Lake Wilson
Washington County, Arkansas190 acresView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Limited data
Lake Wilson in Washington County, Arkansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8 ft visibility. Surface area: 190.2 acres.
- Clarity
- 8 ft
- Area
- 190 acres
- Trend
- ↓ Declining
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Watch Lake Wilson’s letter
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Why Lake Wilson has no grade
Lake Wilson has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Lake Wilson is Not Rated — not an F. Its 8-foot median from 6 readings collected 2017–2024 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by ADEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Wilson is a 190-acre lake in Washington County, Arkansas. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2024-07-04. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Lake Wilson
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 8 ft. TSI 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 190 acres |
No bathymetric survey has been published for Lake Wilson, so its depth is not documented here.
Fishing Lake Wilson
Water Quality Trend: ↓ Declining
Based on 10 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.076 m/yr | 5 |
| Phosphorus | ↓ Declining | +0.49 µg/L/yr | 6 |
| Chlorophyll-a | ↓ Declining | +0.62 µg/L/yr | 7 |
Reservoir Info (USACE NID)
Lake Wilson is a man-made reservoir impounded by the Wilson Lake Dam (completed 1941), built primarily for recreation on the White River-Tr; earth-type dam, 49 ft tall and 640 ft long.
- Surface area
- 190.2 ac
- Normal storage
- 317.5 ac-ft
- Max storage
- 512.2 ac-ft
- Hazard class
- Significant
- Owner
- City of Fayetteville
Source: USACE National Inventory of Dams, NID ID AR00285 · Operator website
Graded lakes near Lake Wilson
Lake Wilson has no grade, but these lakes within a short drive do.
Nearby Lakes in Washington County
Frequently asked questions about Lake Wilson
Where is Lake Wilson?
- Lake Wilson is a lake in Washington County, Arkansas. 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 Lake Wilson?
- Lake Wilson in Washington County, Arkansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8 ft visibility. Surface area: 190.2 acres.
Is Lake Wilson safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
6 measurements from 1 monitoring station, 2017–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS6 samples · 2017–2024
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.