Lake Ann
Benton County, Arkansas90 acresView mapDirections
Arkansas DEQ publishes the water-quality measurements for Lake Ann. Here is what has been measured.
- 32 ft max depth
- Limited data
Lake Ann in Benton County, Arkansas has water-quality measurements published by Arkansas DEQ, shown here as reported. Phosphorus: 22 µg/L. Chlorophyll-a (algae): 5.8 µg/L. Surface area: 90 acres.
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. Methodology: how these readings are compared.
Lake Ann covers about 90 acres in Benton County. Vrbo is where to look for cabins and lake homes around Lake Ann, and Booking.com and Expedia search hotels near the lake for your dates.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lake Ann is safe to swim in today is a call for the Arkansas Division of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Ann
These are the measurements Arkansas DEQ publishes for Lake Ann, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 22 µg/L. Chlorophyll-a 5.8 µg/L. TSI 48.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 22µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 5.8µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 48 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Lake Ann
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~32 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
Watershed (drainage) area
8 sq mi
HydroLAKES / HydroSHEDS
Shoreline
2.3 mi
HydroLAKES / HydroSHEDS
Elevation
1,086 ft
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.
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Stays near Lake Ann
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Fishing Lake Ann
Water Quality Trend: Improving
Based on 4 years of monitoring (2012–2015).
Phosphorus
Improving-0.85 µg/L/yr4 years
Chlorophyll-a
Improving-1.93 µg/L/yr4 years
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. Its water-quality measurements are published by Arkansas DEQ and shown on this page as reported.
What is the water quality of Lake Ann?
- Lake Ann in Benton County, Arkansas has water-quality measurements published by Arkansas DEQ, shown here as reported. Phosphorus: 22 µg/L. Chlorophyll-a (algae): 5.8 µg/L. Surface area: 90 acres.
Is Lake Ann safe to swim in?
- Nutrient and algae readings are 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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)