Brantley Reservoir Deep
Eddy County, New Mexico39,301 acresView 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.
- Impaired · Fish consumption advisory
- Limited data
Brantley Reservoir Deep in Eddy County, New Mexico is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.9 ft visibility. Chlorophyll-a (algae): 21 µg/L. Surface area: 39301 acres.
- Clarity
- 3.9 ft
- Area
- 39,301 acres
- Chlorophyll-a
- 21 µg/L
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Watch Brantley Reservoir Deep’s letter
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Why Brantley Reservoir Deep 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 Brantley Reservoir Deep, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity and algae (chlorophyll-a), but not phosphorus.
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 NMED and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Brantley Reservoir Deep is a 39,301-acre lake in Eddy County, New Mexico.
Source: EPA Water Quality Portal sampling records, NMED, last sampled 2022-04-13. Grade methodology: LakeQuality methodology.
What Brantley Reservoir Deep is good for
From access and monitoring records, not editorial picks.
- Big water39,301 acres
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Brantley Reservoir Deep is listed impaired under Clean Water Act §303(d) (IR 5) for fish consumption advisory, mercury. Check local advisories before you swim.
Water quality measurements for Brantley Reservoir Deep
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 3.9 ft. Chlorophyll-a 21 µg/L. TSI 59.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.9 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 21 µg/L | Not graded |
| Trophic State Index (TSI) | 59 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Current Conditions
USGS snapshot Sep 7, 2026, 3:00 PM from gauge 08401450 (BRANTLEY LAKE NEAR CARLSBAD, NM). Station page ↗ — a live reading replaces this snapshot when the gauge responds. Missing live data is not an all-clear.
→ Brantley Reservoir Deep water level: the live USGS gauge reading
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 39,301 acres |
No bathymetric survey has been published for Brantley Reservoir Deep, so its depth is not documented here.
Fishing Brantley Reservoir Deep
Reservoir Info (USACE NID)
Brantley Reservoir Deep is a man-made reservoir impounded by the Brantley Dam (completed 1989), built primarily for flood risk reduction on the Pecos River; concrete-type dam, 144 ft tall and 20,850 ft long.
- Surface area
- 39,301 ac
- Normal storage
- 41,054 ac-ft
- Max storage
- 966,300 ac-ft
- Drainage area
- 17,650 sq mi
- Hazard class
- High
- Owner
- BUREAU OF RECLAMATION
All listed purposes: Flood Risk Reduction;Irrigation;Recreation.
Source: USACE National Inventory of Dams, NID ID NM00500 · Operator website · Matched by proximity (0.6 km)
EPA Impairment Status
Brantley Reservoir Deep 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 NM-2205_00 · Official waterbody report · Matched by proximity (2.68 km)
Graded lakes near Brantley Reservoir Deep
Brantley Reservoir Deep has no grade, but these lakes within a short drive do.
Nearby Lakes in Eddy County
Frequently asked questions about Brantley Reservoir Deep
Where is Brantley Reservoir Deep?
- Brantley Reservoir Deep is a lake in Eddy County, New Mexico. 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 Brantley Reservoir Deep?
- Brantley Reservoir Deep in Eddy County, New Mexico is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.9 ft visibility. Chlorophyll-a (algae): 21 µg/L. Surface area: 39301 acres.
Is Brantley Reservoir Deep safe to swim in?
- The letter is not a swimming clearance. Brantley Reservoir Deep is listed impaired under Clean Water Act §303(d) (IR 5) for fish consumption advisory, mercury. Check local advisories before you swim.
What is the water level at Brantley Reservoir Deep?
- The USGS snapshot on this page for Brantley Reservoir Deep is 3241.77 ft of water-surface elevation, recorded Sep 7, 2026, 3:00 PM at gauge 08401450. Current Conditions hydrates a live NWIS reading from that same station when the gauge responds. A missed live fetch is not an all-clear.
Explore Brantley Reservoir Deep across LakeQuality
2 thermal springs within 20.9 mi, nearest Indian Big Spring
Species activity outlook by water temperature and season
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Planning a trip around Carlsbad Caverns?
Brantley Reservoir Deep is about 30 miles from Carlsbad Caverns National Park. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Carlsbad Caverns →More New Mexico Lake Rankings
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Where this data comes from
12 measurements from 1 monitoring station, 2013–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- NM Environmental Dept./SWQB
21NMEX_WQX12 samples · 2013–2022
Analytical methods
- Phosphorus by Colorimetry
- 10200 H 2 ~ Chlorophyll a-b-c Determination by spectrophotometer
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
Impairment status from EPA ATTAINS 303(d) database