Beaver Lake
Washington County, ArkansasView 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.
- Impaired · Turbidity
- Public access
- Limited data
Beaver Lake in Washington County, Arkansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 9.4 ft visibility.
- Clarity
- 9.4 ft
- Trend
- ↑ Improving
- Public access
- Yes
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Stays near Beaver Lake
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Watch Beaver Lake’s letter
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Why Beaver Lake has no grade
Beaver Lake 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, Beaver Lake is Not Rated — not an F. Its 9.4-foot median from 31 readings collected 2014–2022 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.
Beaver Lake is a lake in Washington County, Arkansas. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2022-07-20. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Beaver Lake is listed impaired under Clean Water Act §303(d) (IR 5A) for turbidity. Check local advisories before you swim.
Water quality measurements for Beaver Lake
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 9.4 ft. TSI 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.4 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Beaver Lake
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.343 m/yr | 6 |
EPA Impairment Status
Beaver Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5A).
Causes of impairment
Source: EPA ATTAINS assessment unit AR_11010001_4041 · Official waterbody report
Graded lakes near Beaver Lake
Beaver Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Washington County
Frequently asked questions about Beaver Lake
Where is Beaver Lake?
- Beaver Lake 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 Beaver Lake?
- Beaver Lake in Washington County, Arkansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 9.4 ft visibility.
Is Beaver Lake safe to swim in?
- The letter is not a swimming clearance. Beaver Lake is listed impaired under Clean Water Act §303(d) (IR 5A) for turbidity. Check local advisories before you swim.
Explore Beaver Lake across LakeQuality
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Where this data comes from
31 measurements from 1 monitoring station, 2014–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS31 samples · 2014–2022
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