Lake Crabtree
Wake County, North Carolina473 acresView mapDirections
Nutrients and algae run well above the regional average.
- Hypereutrophic
- #6 of 14 in the county
- 40 ft max depth
Lake Crabtree in Wake County, North Carolina has a water quality grade of F (Algae-prone). Water clarity: 1.1 ft visibility. Phosphorus: 85 µg/L. Chlorophyll-a (algae): 35 µg/L. Surface area: 473 acres.
- Clarity
- 1.1 ft
- Max depth
- ~40 ft est.
- Area
- 473 acres
- Type
- Hypereutrophic
- Trend
- ↑ Improving
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Stays near Lake Crabtree
Compare lakeside cabins, hotels, and vacation rentals near Lake Crabtree 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 grade measures nutrients and algae, not lodging — cabins and rentals around Lake Crabtree are listed below.
Top-rated places to stay near Lake Crabtree
Prices for Sep 4–6, 4 adults. Change dates on the map below.
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Watch Lake Crabtree’s letter
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Lake Crabtree is a 473-acre highly nutrient-loaded hypereutrophic lake in Wake County, North Carolina with an estimated average depth of about 40 feet. Water quality is graded F based on 2 sampling years through 2025. Overall water quality is improving over recent sampling years. Compared to the 13 other monitored lakes in Wake County, Lake Crabtree ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, NCDEQ, last sampled 2025-09-11. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyAlgae risk
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The F is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: F (Algae-prone)
Very murky, less than 1.1 ft of visibility. Phosphorus 85 µg/L. Chlorophyll-a 35 µg/L. TSI 70. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.1 ft | Not graded |
| Phosphorus | 85 µg/L | Poor |
| Chlorophyll-a (Algae) | 35 µg/L | Poor |
| Trophic State Index (TSI) | 70 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
→ Lake Crabtree water level: the live USGS gauge reading
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~40 ft est. |
| Average Depth | ~19 ft est. |
| Surface Area | 473 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 Crabtree.
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 Lake Crabtree
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -5 µg/L/yr | 2 |
| Chlorophyll-a | → Stable | -0.1 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Lake Crabtree is a man-made reservoir impounded by the Lake Crabtree Dam (completed 1988), built primarily for flood risk reduction on the Crabtree Creek; earth-type dam, 45 ft tall and 1,200 ft long.
- Surface area
- 473 ac
- Normal storage
- 2,040 ac-ft
- Max storage
- 8,950 ac-ft
- Drainage area
- 52.07 sq mi
- Hazard class
- High
- Owner
- Wake County Attorney's Office
All listed purposes: Flood Risk Reduction;Recreation.
Source: USACE National Inventory of Dams, NID ID NC04952 · Operator website
County Ranking
Ranked #6 of 14 lakes in Wake County
Nearby Lakes With Higher Grades
Lake Crabtree holds Grade F. 2 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Wake County
Frequently asked questions about Lake Crabtree
Where is Lake Crabtree?
- Lake Crabtree is a lake in Wake County, North Carolina. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Crabtree?
- Lake Crabtree in Wake County, North Carolina has a water quality grade of F (Algae-prone). Water clarity: 1.1 ft visibility. Phosphorus: 85 µg/L. Chlorophyll-a (algae): 35 µg/L. Surface area: 473 acres.
Is Lake Crabtree safe to swim in?
- The F is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Lake Crabtree?
- No published bathymetric survey covers Lake Crabtree, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 40 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 473 acres.
Explore Lake Crabtree across LakeQuality
Species activity outlook by water temperature and season
Where to stay at North Carolina's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
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Where this data comes from
105 measurements from 3 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
21NC03WQ105 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 (3)
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)