Swepco Lake
Benton County, Arkansas530 acresView mapDirections
Arkansas DEQ publishes the water-quality measurements for Swepco Lake. Here is what has been measured.
- 49 ft max depth
- Limited data
Swepco Lake in Benton County, Arkansas has water-quality measurements published by Arkansas DEQ, shown here as reported. Phosphorus: 70.5 µg/L. Chlorophyll-a (algae): 25.5 µg/L. Surface area: 530 acres.
Swepco Lake is a 530-acre lake in Benton County, Arkansas with an estimated average depth of about 49 feet. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2012-09-10. Methodology: how these readings are compared.
Swepco Lake covers about 530 acres in Benton County. For a place on the water, look through cabin and lake-house rentals near Swepco Lake on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Swepco Lake 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 Swepco Lake
These are the measurements Arkansas DEQ publishes for Swepco Lake, 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 70.5 µg/L. Chlorophyll-a 25.5 µg/L. TSI 64.
| 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 | 70.5µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 25.5µg/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. | 64 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Swepco Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~49 ft est.
Surface area
530 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 Swepco Lake.
Lake Size & Watershed
Watershed (drainage) area
14 sq mi
HydroLAKES / HydroSHEDS
Shoreline
6.7 mi
HydroLAKES / HydroSHEDS
Elevation
1,152 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.
Stays via Stay22
Stays near Swepco Lake
Compare lakeside cabins, hotels, and vacation rentals near Swepco Lake in Benton County, Arkansas — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Swepco Lake
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Fishing Swepco Lake
Water Quality Trend: Improving
Based on 4 years of monitoring (2012–2025).
Phosphorus
Improving-2.08 µg/L/yr3 years
Chlorophyll-a
Stable+0.11 µg/L/yr4 years
Reservoir Info (USACE NID)
Swepco Lake is a man-made reservoir impounded by the Little Flint Creek Dam (completed 1977), built primarily for water supply on the Little Flint Creek; earth-type dam, 115 ft tall and 3,000 ft long.
- Surface area
- 530 ac
- Normal storage
- 18,300 ac-ft
- Max storage
- 24,400 ac-ft
- Drainage area
- 14.4 sq mi
- Hazard class
- High
- Owner
- SWEPCO
All listed purposes: Water Supply;Other.
Source: USACE National Inventory of Dams, NID ID AR01100 · Operator website · Matched by proximity (0.13 km)
Nearby Lakes in Benton County
Frequently asked questions about Swepco Lake
Where is Swepco Lake?
- Swepco Lake 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 Swepco Lake?
- Swepco Lake in Benton County, Arkansas has water-quality measurements published by Arkansas DEQ, shown here as reported. Phosphorus: 70.5 µg/L. Chlorophyll-a (algae): 25.5 µg/L. Surface area: 530 acres.
Is Swepco Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Swepco Lake?
- No published bathymetric survey covers Swepco Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 49 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 530 acres.
Explore Swepco Lake across LakeQuality
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Where this data comes from
4 measurements from 1 monitoring station, 2012. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Arkansas Department of Environmental Quality
ARDEQH2O_WQX4 samples · 2012
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)