Beaver Lake
Benton County, ArkansasView mapDirections
Nutrients and algae sit mid-range for this region.
- Eutrophic
- Impaired · Algal growth
- #2 of 4 in the county
- Public access
Beaver Lake in Benton County, Arkansas has a water quality grade of C (Fair). Water clarity: 4.6 ft visibility. Phosphorus: 23 µg/L. Chlorophyll-a (algae): 9.1 µg/L.
- Clarity
- 4.6 ft
- Type
- Eutrophic
- Phosphorus
- 23 µg/L
- Chlorophyll-a
- 9.1 µg/L
- Trend
- → Stable
- Public access
- Yes
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Watch Beaver Lake’s letter
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Beaver Lake is a productive, nutrient-rich eutrophic lake in Benton County, Arkansas. Water quality is graded C based on 2 sampling years through 2021. Limited fish-species data available. Public access is available with 8 public boat landings. Compared to the 3 other monitored lakes in Benton County, Beaver Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2021-10-05. Grade methodology: LakeQuality methodology.
What Beaver Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch8 documented ramps
Swimming Safety
Grade onlyModerate
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.
The C is nutrients and algae, not a swimming clearance. Beaver Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
Water Quality Grade: C (Fair)
Murky, only visible to about 4.6 ft. Phosphorus 23 µg/L. Chlorophyll-a 9.1 µg/L. TSI 52. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.6 ft | Not graded |
| Phosphorus | 23 µg/L | Fair |
| Chlorophyll-a (Algae) | 9.1 µg/L | Fair |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Recreation & Access
- Natural Walk RoadPublic
- Blue SpringsPublic
- Boat Ramp RoadPublic
- Shoreline WayPublic
- Vaughan RoadPublic
- War Eagle MarinaSemi-private
Showing 6 of 8 documented landings from the USGS National Boat Ramps inventory.
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Beaver Lake
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.422 m/yr | 7 |
| Phosphorus | → Stable | -0.29 µg/L/yr | 7 |
| Chlorophyll-a | → Stable | -0.13 µg/L/yr | 7 |
EPA Impairment Status
Beaver Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit AR_11010001_4042 · Official waterbody report
County Ranking
Ranked #2 of 4 lakes in Benton County
Nearby Lakes in Benton County
Frequently asked questions about Beaver Lake
Where is Beaver Lake?
- Beaver Lake is a lake in Benton County, Arkansas. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Beaver Lake?
- Beaver Lake in Benton County, Arkansas has a water quality grade of C (Fair). Water clarity: 4.6 ft visibility. Phosphorus: 23 µg/L. Chlorophyll-a (algae): 9.1 µg/L.
Is Beaver Lake safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Beaver Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
Are there boat ramps on Beaver Lake?
- Beaver Lake has 8 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Natural Walk Road, Blue Springs, Boat Ramp Road, Shoreline Way, among others. Public access is listed as yes.
Explore Beaver Lake across LakeQuality
More Arkansas Lake Rankings
Other Grade C Lakes in Arkansas
Eutrophic Lakes in Arkansas
Where this data comes from
1,042 measurements from 5 monitoring stations, 2012–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Arkansas Water Science Center
USGS-AR979 samples · 2012–2021 - Arkansas Department of Environmental Quality
ARDEQH2O_WQX63 samples · 2012–2019
Analytical methods
- Secchi disk method
- P, wu, WCA, persulfate CF color
- Plant pigments, sonication & 445
- Pigments, algae, EPA445.0 w/ACTN
- HACH, sensor model 2100 AN, R-On
- 4500 P J ~ Persulfate Method for Simultaneous Determination of Total Nitrogen and Total Phosphorus
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (5)
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