Bois D'Arc Lake
Fannin County, Texas16,500 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
- Limited data
Bois D'Arc Lake in Fannin County, Texas has a water quality grade of B (Good). Water clarity: 2.4 ft visibility. Phosphorus: 42 µg/L. Surface area: 16500 acres.
- Clarity
- 2.4 ft
- Area
- 16,500 acres
- Type
- Eutrophic
- Phosphorus
- 42 µg/L
- Trend
- ↑ Improving
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Watch Bois D'Arc Lake’s letter
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Bois D'Arc Lake is a 16,500-acre productive, nutrient-rich eutrophic lake in Fannin County, Texas. Water quality is graded B based on 1 sampling years through 2023. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2023-11-15. Grade methodology: LakeQuality methodology.
What Bois D'Arc Lake is good for
From access and monitoring records, not editorial picks.
- Big water16,500 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 2.4 ft of visibility. Phosphorus 42 µg/L. TSI 61. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.4 ft | Not graded |
| Phosphorus | 42 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 16,500 acres |
No bathymetric survey has been published for Bois D'Arc Lake, so its depth is not documented here.
Fishing Bois D'Arc Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.4 m/yr | 2 |
Reservoir Info (USACE NID)
Bois D'Arc Lake is a man-made reservoir impounded by the Bois D Arc Lake Dam (completed 2023) on the Bois D'Arc Creek; earth-type dam, 90 ft tall and 11,200 ft long.
- Surface area
- 16,500 ac
- Normal storage
- 367,600 ac-ft
- Max storage
- 765,340 ac-ft
- Drainage area
- 327 sq mi
- Hazard class
- High
- Owner
- NORTH TEXAS MUNICIPAL WATER DISTRICT
Source: USACE National Inventory of Dams, NID ID TX07507 · Operator website
County Ranking
Ranked #1 of 1 lakes in Fannin County
Nearby Lakes in Fannin County
Frequently asked questions about Bois D'Arc Lake
Where is Bois D'Arc Lake?
- Bois D'Arc Lake is a lake in Fannin County, Texas. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Bois D'Arc Lake?
- Bois D'Arc Lake in Fannin County, Texas has a water quality grade of B (Good). Water clarity: 2.4 ft visibility. Phosphorus: 42 µg/L. Surface area: 16500 acres.
Is Bois D'Arc Lake safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Bois D'Arc Lake across LakeQuality
More Texas Lake Rankings
Other Grade B Lakes in Texas
Eutrophic Lakes in Texas
Where this data comes from
58 measurements from 3 monitoring stations, 2021–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Texas Water Science Center
USGS-TX58 samples · 2021–2023
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.