Lynchburg Reservoir
Harris County, Texas200 acresView mapDirections
Nutrients and algae sit mid-range for this region.
- Mesotrophic
- Impaired · Dioxins
- #1 of 4 in the county
- Public access
Lynchburg Reservoir in Harris County, Texas has a water quality grade of C (Fair). Water clarity: 1.1 ft visibility. Phosphorus: 98.5 µg/L. Chlorophyll-a (algae): 5.9 µg/L. Surface area: 200 acres.
- Clarity
- 1.1 ft
- Area
- 200 acres
- Type
- Mesotrophic
- Phosphorus
- 98.5 µg/L
- Chlorophyll-a
- 5.9 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Lynchburg Reservoir’s letter
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Lynchburg Reservoir is a 200-acre mesotrophic lake in Harris County, Texas. Water quality is graded C based on 2 sampling years through 2023. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 3 other monitored lakes in Harris County, Lynchburg Reservoir ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2023-09-12. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyModerate
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 C is nutrients and algae, not a swimming clearance. Lynchburg Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for dioxins, pCBs. Check local advisories before you swim.
Water Quality Grade: C (Fair)
Very murky, less than 1.1 ft of visibility. Phosphorus 98.5 µg/L. Chlorophyll-a 5.9 µg/L. TSI 65. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.1 ft | Not graded |
| Phosphorus | 98.5 µg/L | Poor |
| Chlorophyll-a (Algae) | 5.9 µg/L | Good |
| Trophic State Index (TSI) | 65 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 200 acres |
| Public Access | Yes |
No bathymetric survey has been published for Lynchburg Reservoir, so its depth is not documented here.
Fishing Lynchburg Reservoir
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.25 m/yr | 4 |
| Phosphorus | ↓ Declining | +9.6 µg/L/yr | 4 |
| Chlorophyll-a | ↓ Declining | +1.84 µg/L/yr | 4 |
Reservoir Info (USACE NID)
Lynchburg Reservoir is a man-made reservoir impounded by the Lynchburg Reservoir Dam (completed 1976) on the Off Ch-San Jacinto River; earth-type dam, 35 ft tall and 15,315 ft long.
- Surface area
- 200 ac
- Normal storage
- 4,700 ac-ft
- Max storage
- 5,188 ac-ft
- Drainage area
- 0.32 sq mi
- Hazard class
- High
- Owner
- COASTAL WATER AUTHORITY
Source: USACE National Inventory of Dams, NID ID TX03413 · Operator website
EPA Impairment Status
Lynchburg Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit TX-2430_01 · Official waterbody report · Matched by proximity (1.19 km)
County Ranking
Ranked #1 of 4 lakes in Harris County
Nearby Lakes in Harris County
Frequently asked questions about Lynchburg Reservoir
Where is Lynchburg Reservoir?
- Lynchburg Reservoir is a lake in Harris County, Texas. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lynchburg Reservoir?
- Lynchburg Reservoir in Harris County, Texas has a water quality grade of C (Fair). Water clarity: 1.1 ft visibility. Phosphorus: 98.5 µg/L. Chlorophyll-a (algae): 5.9 µg/L. Surface area: 200 acres.
Is Lynchburg Reservoir safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Lynchburg Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for dioxins, pCBs. Check local advisories before you swim.
Explore Lynchburg Reservoir across LakeQuality
More Texas Lake Rankings
Other Grade C Lakes in Texas
Mesotrophic Lakes in Texas
Where this data comes from
176 measurements from 2 monitoring stations, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Texas Water Science Center
USGS-TX176 samples · 2020–2023
Monitoring station identifiers (2)
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
Impairment status from EPA ATTAINS 303(d) database