New Marlin City Lake
Falls County, Texas485 acresView mapDirections
Nutrients and algae run well above the regional average.
- Hypereutrophic
- #1 of 1 in the county
- 48 ft max depth
- Public access
- Limited data
New Marlin City Lake in Falls County, Texas has a water quality grade of F (Algae-prone). Water clarity: 1.5 ft visibility. Phosphorus: 130 µg/L. Chlorophyll-a (algae): 62 µg/L. Surface area: 485 acres.
- Clarity
- 1.5 ft
- Max depth
- ~48 ft est.
- Area
- 485 acres
- Type
- Hypereutrophic
- Phosphorus
- 130 µg/L
- Chlorophyll-a
- 62 µg/L
- Trend
- → Stable
- Public access
- Yes
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Stays near New Marlin City Lake
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New Marlin City Lake is a 485-acre highly nutrient-loaded hypereutrophic lake in Falls County, Texas with an estimated average depth of about 48 feet. Water quality is graded F based on 2 sampling years through 2026. Water clarity is declining over recent sampling years. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2026-02-10. Grade methodology: LakeQuality methodology.
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 F is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: F (Algae-prone)
Very murky, less than 1.5 ft of visibility. Phosphorus 130 µg/L. Chlorophyll-a 62 µg/L. TSI 72. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.5 ft | Not graded |
| Phosphorus | 130 µg/L | Poor |
| Chlorophyll-a (Algae) | 62 µg/L | Poor |
| Trophic State Index (TSI) | 72 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~48 ft est. |
| Average Depth | ~11 ft est. |
| Surface Area | 485 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 New Marlin City 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.
Fishing New Marlin City Lake
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.067 m/yr | 5 |
| Phosphorus | ↑ Improving | -24 µg/L/yr | 4 |
| Chlorophyll-a | → Stable | -0.74 µg/L/yr | 5 |
Reservoir Info (USACE NID)
New Marlin City Lake is a man-made reservoir impounded by the Marlin New City Lake Dam (completed 1949), built primarily for water supply on the Big Sandy Creek; earth-type dam, 37 ft tall and 3,800 ft long.
- Surface area
- 485 ac
- Normal storage
- 3,135 ac-ft
- Max storage
- 7,221 ac-ft
- Drainage area
- 22.3 sq mi
- Hazard class
- High
- Owner
- CITY OF MARLIN
Source: USACE National Inventory of Dams, NID ID TX01038 · Operator website · Matched by proximity (0.27 km)
County Ranking
Ranked #1 of 1 lakes in Falls County
Nearby Lakes in Falls County
Frequently asked questions about New Marlin City Lake
Where is New Marlin City Lake?
- New Marlin City Lake is a lake in Falls County, Texas. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for New Marlin City Lake?
- New Marlin City Lake in Falls County, Texas has a water quality grade of F (Algae-prone). Water clarity: 1.5 ft visibility. Phosphorus: 130 µg/L. Chlorophyll-a (algae): 62 µg/L. Surface area: 485 acres.
Is New Marlin City Lake safe to swim in?
- The F is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is New Marlin City Lake?
- No published bathymetric survey covers New Marlin City Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 48 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 485 acres.
Explore New Marlin City Lake across LakeQuality
More Texas Lake Rankings
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Where this data comes from
56 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Texas Commission on Environmental Quality
TCEQMAIN56 samples · 2020–2026
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)