Tunnel Reservoir
Apache County, Arizona164 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.
- Public access
- Limited data
Tunnel Reservoir in Apache County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 164 acres.
- Area
- 164 acres
- Public access
- Yes
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Watch Tunnel Reservoir’s letter
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Why Tunnel Reservoir 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 Tunnel Reservoir, 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.
Tunnel Reservoir is a 164-acre lake in Apache County, Arizona. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2022-04-17. Grade methodology: LakeQuality methodology.
What Tunnel Reservoir 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 Tunnel Reservoir
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 |
|---|---|
| Surface Area | 164 acres |
| Public Access | Yes |
No bathymetric survey has been published for Tunnel Reservoir, so its depth is not documented here.
Recreation & Access
- Tunnel ReservoirPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Tunnel Reservoir
Reservoir Info (USACE NID)
Tunnel Reservoir is a man-made reservoir impounded by the River Reservoir #3 (completed 1896), built primarily for irrigation on the Little Colorado River; rockfill-type dam, 58 ft tall and 1,212 ft long.
- Surface area
- 164 ac
- Normal storage
- 2,146 ac-ft
- Max storage
- 3,195 ac-ft
- Drainage area
- 34.4 sq mi
- Hazard class
- High
- Owner
- PIONEER IRRIGATION COMPANY INC.
Source: USACE National Inventory of Dams, NID ID AZ00007 · Operator website · Matched by proximity (0.79 km)
Nearby Lakes in Apache County
Frequently asked questions about Tunnel Reservoir
Where is Tunnel Reservoir?
- Tunnel Reservoir 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 Tunnel Reservoir?
- Tunnel Reservoir in Apache County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 164 acres.
Is Tunnel Reservoir safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Tunnel Reservoir?
- Tunnel Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Tunnel Reservoir. Public access is listed as yes.
Explore Tunnel Reservoir across LakeQuality
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Where this data comes from
2 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
GLEC2 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
Named boat-access points from the USGS National Boat Ramps inventory