Concho Lake
Apache County, Arizona155 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.
- 15 ft max depth
- Public access
- Limited data
Concho Lake in Apache County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 155 acres.
- Max depth
- ~15 ft est.
- Area
- 155 acres
- Public access
- Yes
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Watch Concho Lake’s letter
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Why Concho Lake 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 Concho Lake, 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 ADEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Concho Lake is a 155-acre lake in Apache County, Arizona with an estimated average depth of about 15 feet. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2022-04-18. Grade methodology: LakeQuality methodology.
What Concho Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Concho Lake
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 Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~15 ft est. |
| Average Depth | ~11 ft est. |
| Surface Area | 155 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Arizona has not published bathymetry for Concho 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.
Recreation & Access
- Conch Lake Recreation AreaPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Concho Lake
Reservoir Info (USACE NID)
Concho Lake is a man-made reservoir impounded by the Concho Springs (completed 1927), built primarily for irrigation on the Concho Springs; rockfill-type dam, 26 ft tall and 310 ft long.
- Surface area
- 155 ac
- Normal storage
- 1,198 ac-ft
- Max storage
- 1,560 ac-ft
- Drainage area
- 7.04 sq mi
- Hazard class
- Significant
- Owner
- CONCHO WATER CO., INC.
All listed purposes: Irrigation;Recreation.
Source: USACE National Inventory of Dams, NID ID AZ00032 · Operator website
Nearby Lakes in Apache County
Frequently asked questions about Concho Lake
Where is Concho Lake?
- Concho Lake is a lake in Apache County, Arizona. 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 Concho Lake?
- Concho Lake in Apache County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 155 acres.
Is Concho Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Concho Lake?
- No published bathymetric survey covers Concho Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 15 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 155 acres.
Are there boat ramps on Concho Lake?
- Concho Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Conch Lake Recreation Area. Public access is listed as yes.
Explore Concho Lake across LakeQuality
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Where this data comes from
4 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Great Lakes Environmental Center
GLEC4 samples · 2022
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
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)
Named boat-access points from the USGS National Boat Ramps inventory