Lake Twitty
Union County, North Carolina327 acresView mapDirections
NC DEQ publishes the water-quality measurements for Lake Twitty. Here is what has been measured.
- Hypereutrophic
- 43 ft max depth
- Limited data
Lake Twitty in Union County, North Carolina has water-quality measurements published by NC DEQ, shown here as reported. Phosphorus: 80 µg/L. Chlorophyll-a (algae): 49 µg/L. Surface area: 327 acres.
Lake Twitty is a 327-acre highly nutrient-loaded hypereutrophic lake in Union County, North Carolina with an estimated average depth of about 43 feet. Compared to the 2 other monitored lakes in Union County, Lake Twitty ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, NCDEQ, last sampled 2021-09-29. Methodology: how these readings are compared.
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 Lake Twitty 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 Twitty
These are the measurements NC DEQ publishes for Lake Twitty, 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 80 µg/L. Chlorophyll-a 49 µg/L. TSI 68.
| 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 | 80µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 49µg/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. | 68 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Lake Twitty
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~43 ft est.
Surface area
327 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 Twitty.
Lake Size & Watershed
Watershed (drainage) area
35 sq mi
HydroLAKES / HydroSHEDS
Shoreline
5.9 mi
HydroLAKES / HydroSHEDS
Elevation
505 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 Twitty
Compare lakeside cabins, hotels, and vacation rentals near Lake Twitty in Union 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 Twitty are listed below.
Top-rated places to stay near Lake Twitty
Prices for Oct 23–25, 4 adults. Change dates on the map below.
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Fishing Lake Twitty
Reservoir Info (USACE NID)
Lake Twitty is a man-made reservoir impounded by the Twitty Dam (completed 1973), built primarily for water supply on the Stewarts Creek; earth-type dam, 60 ft tall and 790 ft long.
- Surface area
- 327 ac
- Normal storage
- 9,600 ac-ft
- Max storage
- 17,000 ac-ft
- Drainage area
- 35.21 sq mi
- Hazard class
- High
- Owner
- City of Monroe
Source: USACE National Inventory of Dams, NID ID NC00532 · Operator website
Nearby Lakes in Union County
Frequently asked questions about Lake Twitty
Where is Lake Twitty?
- Lake Twitty is a lake in Union 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 Twitty?
- Lake Twitty in Union County, North Carolina has water-quality measurements published by NC DEQ, shown here as reported. Phosphorus: 80 µg/L. Chlorophyll-a (algae): 49 µg/L. Surface area: 327 acres.
Is Lake Twitty safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Lake Twitty?
- No published bathymetric survey covers Lake Twitty, 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 327 acres.
Explore Lake Twitty across LakeQuality
More lakes in North Carolina
Other Lakes in North Carolina
Hypereutrophic Lakes in North Carolina
Where this data comes from
48 measurements from 3 monitoring stations, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North Carolina Dept of Environmental Quality NCDEQ-DWR WQX
21NC03WQ48 samples · 2021
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- 2130 B ~ Nephelometric Method
Monitoring station identifiers (3)
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)