Lake Nasworthy S Concho Arm
Tom Green County, TexasView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Public access
- Limited data
Lake Nasworthy S Concho Arm in Tom Green County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar.
- Public access
- Yes
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Watch Lake Nasworthy S Concho Arm’s letter
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Why Lake Nasworthy S Concho Arm has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lake Nasworthy S Concho Arm, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by TCEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Nasworthy S Concho Arm is a lake in Tom Green County, Texas. Limited fish-species data available. Public access is available with 4 public boat landings.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2022-04-05. Grade methodology: LakeQuality methodology.
What Lake Nasworthy S Concho Arm is good for
From access and monitoring records, not editorial picks.
- Boat launch4 documented ramps
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Lake Nasworthy S Concho Arm
These readings exist but are not enough for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
→ Lake Nasworthy S Concho Arm water level: the live USGS gauge reading
Recreation & Access
- South Concho Drive AccessPublic
- South Concho Drive AccessPublic
- San Angelo Nature CenterPublic
- Water Dawg RentalsSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Nasworthy S Concho Arm
Graded lakes near Lake Nasworthy S Concho Arm
Lake Nasworthy S Concho Arm has no grade, but these lakes within a short drive do.
Nearby Lakes in Tom Green County
Frequently asked questions about Lake Nasworthy S Concho Arm
Where is Lake Nasworthy S Concho Arm?
- Lake Nasworthy S Concho Arm is a lake in Tom Green County, Texas. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Lake Nasworthy S Concho Arm?
- Lake Nasworthy S Concho Arm in Tom Green County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Lake Nasworthy S Concho Arm safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Lake Nasworthy S Concho Arm?
- Lake Nasworthy S Concho Arm has 4 documented boat landings in the USGS National Boat Ramps inventory. Named access points include South Concho Drive Access, South Concho Drive Access, San Angelo Nature Center, Water Dawg Rentals. Public access is listed as yes.
Explore Lake Nasworthy S Concho Arm across LakeQuality
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Where this data comes from
11 measurements from 1 monitoring station, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Texas Commission on Environmental Quality
TCEQMAIN11 samples · 2020–2022
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
Named boat-access points from the USGS National Boat Ramps inventory