Lake Ann
Benton County, Arkansas90 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- 32 ft max depth
- Limited data
Lake Ann in Benton County, Arkansas is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 22 µg/L. Chlorophyll-a (algae): 5.8 µg/L. Surface area: 90 acres.
- Max depth
- ~32 ft est.
- Area
- 90 acres
- Phosphorus
- 22 µg/L
- Chlorophyll-a
- 5.8 µg/L
- Trend
- ↑ Improving
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Watch Lake Ann’s letter
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Why Lake Ann 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 Lake Ann, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
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 ADEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Ann is a 90-acre lake in Benton County, Arkansas with an estimated average depth of about 32 feet. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2016-05-23. 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 Ann
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 22 µg/L. Chlorophyll-a 5.8 µg/L. TSI 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 22 µg/L | Not graded |
| Chlorophyll-a (Algae) | 5.8 µg/L | Not graded |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~32 ft est. |
| Average Depth | ~21 ft est. |
| Surface Area | 90 acres |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Arkansas has not published bathymetry for Lake Ann.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Lake Ann
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -0.85 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -1.93 µg/L/yr | 4 |
Reservoir Info (USACE NID)
Lake Ann is a man-made reservoir impounded by the Lake Ann Dam (completed 1970), built primarily for recreation on the Pinion Creek; earth-type dam, 65 ft tall and 760 ft long.
- Surface area
- 90 ac
- Normal storage
- 1,800 ac-ft
- Max storage
- 2,900 ac-ft
- Drainage area
- 7.5 sq mi
- Hazard class
- High
- Owner
- Bella Vista Village Property Owners Association
Source: USACE National Inventory of Dams, NID ID AR00264 · Operator website
Nearby Lakes in Benton County
Frequently asked questions about Lake Ann
Where is Lake Ann?
- Lake Ann is a lake in Benton County, Arkansas. 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 Lake Ann?
- Lake Ann in Benton County, Arkansas is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 22 µg/L. Chlorophyll-a (algae): 5.8 µg/L. Surface area: 90 acres.
Is Lake Ann safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Lake Ann?
- No published bathymetric survey covers Lake Ann, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 32 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 90 acres.
Explore Lake Ann across LakeQuality
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Where this data comes from
37 measurements from 1 monitoring station, 2012–2016. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Arkansas Department of Environmental Quality
ARDEQH2O_WQX37 samples · 2012–2016
Analytical methods
- 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 (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
Lake size & watershed from HydroLAKES (HydroSHEDS)