Fairfield Lake
Freestone County, Texas2,350 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↑ up from C at the last regrade
- Eutrophic
- #1 of 1 in the county
- 62 ft max depth
- Public access
- Limited data
Fairfield Lake in Freestone County, Texas has a water quality grade of B (Good). Water clarity: 3.2 ft visibility. Phosphorus: 40 µg/L. Chlorophyll-a (algae): 24.9 µg/L. Surface area: 2350 acres.
- Clarity
- 3.2 ft
- Max depth
- ~62 ft est.
- Area
- 2,350 acres
- Type
- Eutrophic
- Phosphorus
- 40 µg/L
- Chlorophyll-a
- 24.9 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Fairfield Lake’s letter
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Fairfield Lake is a 2,350-acre productive, nutrient-rich eutrophic lake in Freestone County, Texas with an estimated average depth of about 62 feet. Water quality is graded B based on 1 sampling years through 2023. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2023-04-19. Grade methodology: LakeQuality methodology.
What Fairfield Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
- Big water2,350 acres
Swimming Safety
Grade onlyLimited data
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 B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: B (Good)
Very murky, less than 3.2 ft of visibility. Phosphorus 40 µg/L. Chlorophyll-a 24.9 µg/L. TSI 60. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.2 ft | Not graded |
| Phosphorus | 40 µg/L | Good |
| Chlorophyll-a (Algae) | 24.9 µg/L | Not graded |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~62 ft est. |
| Average Depth | ~36 ft est. |
| Surface Area | 2,350 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Texas has not published bathymetry for Fairfield Lake.
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.
Recreation & Access
- Fairfield Lake State Park BPublic
- Fairfield Lake State Park APublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Fairfield Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.12 m/yr | 2 |
| Phosphorus | ↑ Improving | -5 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Fairfield Lake is a man-made reservoir impounded by the Fairfield Lake Dam (completed 1969), built primarily for other on the Big Brown Creek; earth-type dam, 77 ft tall and 4,350 ft long.
- Surface area
- 2,350 ac
- Normal storage
- 44,169 ac-ft
- Max storage
- 70,840 ac-ft
- Drainage area
- 34 sq mi
- Hazard class
- Low
- Owner
- LUMINANT POWER COMPANY LLC
Source: USACE National Inventory of Dams, NID ID TX00692 · Operator website
County Ranking
Ranked #1 of 1 lakes in Freestone County
Nearby Lakes in Freestone County
Frequently asked questions about Fairfield Lake
Where is Fairfield Lake?
- Fairfield Lake is a lake in Freestone County, Texas. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Fairfield Lake?
- Fairfield Lake in Freestone County, Texas has a water quality grade of B (Good). Water clarity: 3.2 ft visibility. Phosphorus: 40 µg/L. Chlorophyll-a (algae): 24.9 µg/L. Surface area: 2350 acres.
Is Fairfield Lake safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Fairfield Lake?
- No published bathymetric survey covers Fairfield Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 62 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 2350 acres.
Are there boat ramps on Fairfield Lake?
- Fairfield Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Fairfield Lake State Park B, Fairfield Lake State Park A. Public access is listed as yes.
Explore Fairfield Lake across LakeQuality
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Where this data comes from
21 measurements from 1 monitoring station, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Texas Commission on Environmental Quality
TCEQMAIN21 samples · 2020–2023
Monitoring station identifiers (1)
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)
Named boat-access points from the USGS National Boat Ramps inventory