Siloam Springs Lake
Benton County, ArkansasView mapDirections
Arkansas DEQ publishes the water-quality measurements for Siloam Springs Lake. Here is what has been measured.
- Hypereutrophic
- 37 ft max depth
- Limited data
Siloam Springs Lake in Benton County, Arkansas has water-quality measurements published by Arkansas DEQ, shown here as reported. Phosphorus: 70 µg/L. Chlorophyll-a (algae): 34.4 µg/L.
Siloam Springs Lake is a highly nutrient-loaded hypereutrophic lake in Benton County, Arkansas with an estimated average depth of about 37 feet. Overall water quality is improving over recent sampling years. Compared to the 3 other monitored lakes in Benton County, Siloam Springs Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2026-02-23. Methodology: how these readings are compared.
If you are planning to stay, you can search lake houses and cabins around Siloam Springs Lake on Vrbo, or look for a hotel room near the lake on Booking.com or Expedia.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Siloam Springs 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 Siloam Springs Lake
These are the measurements Arkansas DEQ publishes for Siloam Springs 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 µg/L. Chlorophyll-a 34.4 µg/L. TSI 65.
| 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 | 70µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 34.4µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 65 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Siloam Springs Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~37 ft est.
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Arkansas has not published bathymetry for Siloam Springs Lake.
Lake Size & Watershed
Watershed (drainage) area
28 sq mi
HydroLAKES / HydroSHEDS
Surface area
37 acres
HydroLAKES / HydroSHEDS
Shoreline
1.1 mi
HydroLAKES / HydroSHEDS
Elevation
1,056 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 Siloam Springs Lake
Compare lakeside cabins, hotels, and vacation rentals near Siloam Springs 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Siloam Springs Lake are listed below.
Top-rated places to stay near Siloam Springs Lake
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Fishing Siloam Springs 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)
Siloam Springs Lake is a man-made reservoir impounded by the Siloam Springs Lake Dam (completed 1952), built primarily for recreation on the Flint Creek; earth-type dam, 20 ft tall and 900 ft long.
- Normal storage
- 132 ac-ft
- Max storage
- 381 ac-ft
- Hazard class
- Low
- Owner
- City of Siloam Springs
Source: USACE National Inventory of Dams, NID ID AR00259 · Operator website
Nearby Lakes in Benton County
Frequently asked questions about Siloam Springs Lake
Where is Siloam Springs Lake?
- Siloam Springs 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 Siloam Springs Lake?
- Siloam Springs Lake in Benton County, Arkansas has water-quality measurements published by Arkansas DEQ, shown here as reported. Phosphorus: 70 µg/L. Chlorophyll-a (algae): 34.4 µg/L.
Is Siloam Springs Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Siloam Springs Lake?
- No published bathymetric survey covers Siloam Springs Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 37 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Siloam Springs Lake across LakeQuality
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Where this data comes from
39 measurements from 1 monitoring station, 2012–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Arkansas Department of Environmental Quality
ARDEQH2O_WQX39 samples · 2012–2026
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
- Turbidity by Nephelometry
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)