Lake Sweetwater Mid Lake
Nolan County, Texas588 acresView mapDirections
TCEQ publishes the water-quality measurements for Lake Sweetwater Mid Lake. Here is what has been measured.
- Eutrophic
- Impaired · Salinity / chlorides
- 15 ft max depth
- Public access
- Limited data
Lake Sweetwater Mid Lake in Nolan County, Texas has water-quality measurements published by TCEQ, shown here as reported. Water clarity: 3.6 ft visibility. Phosphorus: 30 µg/L. Chlorophyll-a (algae): 8.3 µg/L. Surface area: 588 acres.
Lake Sweetwater Mid Lake is a 588-acre productive, nutrient-rich eutrophic lake in Nolan County, Texas with an estimated average depth of about 15 feet. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2025-08-11. Methodology: how these readings are compared.
What Lake Sweetwater Mid Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
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. Lake Sweetwater Mid Lake is listed impaired under Clean Water Act §303(d) (IR 5) for salinity / chlorides. Check local advisories before you swim.
Whether Lake Sweetwater Mid Lake is safe to swim in today is a call for the Texas Commission on Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Sweetwater Mid Lake
These are the measurements TCEQ publishes for Lake Sweetwater Mid Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 3.6 ft. Phosphorus 30 µg/L. Chlorophyll-a 8.3 µg/L. TSI 54.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 30µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 8.3µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 54 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lake Sweetwater Mid Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~15 ft est.
Surface area
588 acres
Public access
Yes
Listed by TCEQ
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Texas has not published bathymetry for Lake Sweetwater Mid Lake.
Lake Size & Watershed
Watershed (drainage) area
103 sq mi
HydroLAKES / HydroSHEDS
Shoreline
6.3 mi
HydroLAKES / HydroSHEDS
Elevation
2,110 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.
Recreation & Access
- Lake SweetwaterPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Lake Sweetwater Mid Lake
Compare lakeside cabins, hotels, and vacation rentals near Lake Sweetwater Mid Lake in Nolan County, Texas — 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.
Top-rated places to stay near Lake Sweetwater Mid Lake
Prices for Oct 30–Nov 1, 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 Texas’s top lakes →
Follow Lake Sweetwater Mid Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Lake Sweetwater Mid Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2025).
Water clarity
Worsening5 years
Phosphorus
Worsening+10 µg/L/yr3 years
Chlorophyll-a
Worsening+6.16 µg/L/yr5 years
Reservoir Info (USACE NID)
Lake Sweetwater Mid Lake is a man-made reservoir impounded by the Lake Sweetwater Dam (completed 1930), built primarily for water supply on the Bitter & Cottonwood Creeks; earth-type dam, 58 ft tall and 3,030 ft long.
- Surface area
- 588 ac
- Normal storage
- 10,975 ac-ft
- Max storage
- 19,340 ac-ft
- Drainage area
- 104 sq mi
- Hazard class
- High
- Owner
- CITY OF SWEETWATER
All listed purposes: Water Supply;Recreation.
Source: USACE National Inventory of Dams, NID ID TX02735 · Operator website · Matched by proximity (0.49 km)
EPA Impairment Status
Lake Sweetwater Mid Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Other.
Source: EPA ATTAINS assessment unit TX-1237_01 · Official waterbody report
Nearby Lakes in Nolan County
Frequently asked questions about Lake Sweetwater Mid Lake
Where is Lake Sweetwater Mid Lake?
- Lake Sweetwater Mid Lake is a lake in Nolan County, Texas. Its water-quality measurements are published by TCEQ and shown on this page as reported.
What is the water quality of Lake Sweetwater Mid Lake?
- Lake Sweetwater Mid Lake in Nolan County, Texas has water-quality measurements published by TCEQ, shown here as reported. Water clarity: 3.6 ft visibility. Phosphorus: 30 µg/L. Chlorophyll-a (algae): 8.3 µg/L. Surface area: 588 acres.
Is Lake Sweetwater Mid Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Sweetwater Mid Lake is listed impaired under Clean Water Act §303(d) (IR 5) for salinity / chlorides. Check local advisories before you swim.
How deep is Lake Sweetwater Mid Lake?
- No published bathymetric survey covers Lake Sweetwater Mid Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 15 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 588 acres.
Are there boat ramps on Lake Sweetwater Mid Lake?
- Lake Sweetwater Mid Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Sweetwater. Public access is listed as yes.
Can I fish at Lake Sweetwater Mid Lake?
- Lake Sweetwater Mid Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Texas's fish and wildlife agency, so check its current regulations before you go.
Explore Lake Sweetwater Mid Lake across LakeQuality
More lakes in Texas
Other Lakes in Texas
Eutrophic Lakes in Texas
Where this data comes from
47 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Texas Commission on Environmental Quality
TCEQMAIN47 samples · 2020–2025
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory