Lake Benson
Wake County, North Carolina463 acresView mapDirections
NC DEQ publishes the water-quality measurements for Lake Benson. Here is what has been measured.
- Hypereutrophic
- 43 ft max depth
Lake Benson in Wake County, North Carolina has water-quality measurements published by NC DEQ, shown here as reported. Water clarity: 2.3 ft visibility. Phosphorus: 50 µg/L. Chlorophyll-a (algae): 38 µg/L. Surface area: 463 acres.
Lake Benson is a 463-acre highly nutrient-loaded hypereutrophic lake in Wake County, North Carolina with an estimated average depth of about 43 feet. Overall water quality is improving over recent sampling years. Compared to the 13 other monitored lakes in Wake County, Lake Benson ranks #12 for water quality.
Source: EPA Water Quality Portal sampling records, NCDEQ, last sampled 2025-09-10. Methodology: how these readings are compared.
Lake Benson covers about 460 acres in Wake County. If you are planning to stay, you can search lake houses and cabins around Lake Benson on Vrbo, or look for a hotel room near the lake on Booking.com or Expedia.
Swimming conditions
Readings onlyAlgae risk
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 Lake Benson is safe to swim in today is a call for the North Carolina Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Benson
These are the measurements NC DEQ publishes for Lake Benson, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 2.3 ft of visibility. Phosphorus 50 µg/L. Chlorophyll-a 38 µg/L. TSI 64.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 50µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 38µg/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. | 64 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Lake Benson
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~43 ft est.
Surface area
463 acres
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. North Carolina has not published bathymetry for Lake Benson.
Lake Size & Watershed
Watershed (drainage) area
71 sq mi
HydroLAKES / HydroSHEDS
Shoreline
5.9 mi
HydroLAKES / HydroSHEDS
Elevation
249 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 Lake Benson
Compare lakeside cabins, hotels, and vacation rentals near Lake Benson in Wake County, North Carolina — 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 Lake Benson are listed below.
Top-rated places to stay near Lake Benson
Prices for Oct 23–25, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at North Carolina’s top lakes →
Follow Lake Benson’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Lake Benson
Water quality readings over time
2 seasons of samples on record (2020–2025). Calling a direction takes at least 4 years of the same measurement.
Phosphorus
Stable0 µg/L/yr2 years
Chlorophyll-a
Improving-4.2 µg/L/yr2 years
Reservoir Info (USACE NID)
Lake Benson is a man-made reservoir impounded by the Lake Benson Dam (completed 1952), built primarily for other on the Swift Creek; earth-type dam, 26 ft tall and 400 ft long.
- Surface area
- 463 ac
- Normal storage
- 3,070 ac-ft
- Max storage
- 7,200 ac-ft
- Drainage area
- 66 sq mi
- Hazard class
- High
- Owner
- City of Raleigh Public Utilities Department
All listed purposes: Other;Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID NC00861 · Operator website
Nearby Lakes in Wake County
Frequently asked questions about Lake Benson
Where is Lake Benson?
- Lake Benson is a lake in Wake County, North Carolina. Its water-quality measurements are published by NC DEQ and shown on this page as reported.
What is the water quality of Lake Benson?
- Lake Benson in Wake County, North Carolina has water-quality measurements published by NC DEQ, shown here as reported. Water clarity: 2.3 ft visibility. Phosphorus: 50 µg/L. Chlorophyll-a (algae): 38 µg/L. Surface area: 463 acres.
Is Lake Benson safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Lake Benson?
- No published bathymetric survey covers Lake Benson, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 43 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 463 acres.
Explore Lake Benson across LakeQuality
More lakes in North Carolina
Other Lakes in North Carolina
Hypereutrophic Lakes in North Carolina
Where this data comes from
82 measurements from 2 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North Carolina Dept of Environmental Quality NCDEQ-DWR WQX
21NC03WQ82 samples · 2020–2025
Analytical methods
- WSSSOP
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- 2130 B ~ Nephelometric Method
Monitoring station identifiers (2)
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)