Swepco Lake
Benton County, Arkansas530 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.
- 49 ft max depth
- Limited data
Swepco Lake in Benton County, Arkansas is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 70.5 µg/L. Chlorophyll-a (algae): 25.5 µg/L. Surface area: 530 acres.
- Max depth
- ~49 ft est.
- Area
- 530 acres
- Phosphorus
- 70.5 µg/L
- Chlorophyll-a
- 25.5 µg/L
- Trend
- ↑ Improving
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Watch Swepco Lake’s letter
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Why Swepco Lake 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 Swepco Lake, 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.
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. 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 Swepco Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 70.5 µg/L. Chlorophyll-a 25.5 µg/L. TSI 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 70.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 25.5 µg/L | Not graded |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum 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
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 Swepco Lake
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -2.08 µg/L/yr | 3 |
| Chlorophyll-a | → Stable | +0.11 µg/L/yr | 4 |
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)
Graded lakes near Swepco Lake
Swepco Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Benton County
Frequently asked questions about Swepco Lake
Where is Swepco Lake?
- Swepco Lake 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 Swepco Lake?
- Swepco Lake in Benton County, Arkansas is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 70.5 µg/L. Chlorophyll-a (algae): 25.5 µg/L. Surface area: 530 acres.
Is Swepco Lake safe to swim in?
- The letter is 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)
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)