Show Low Lake
Navajo County, Arizona186 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.
- 16 ft max depth
- Public access
- Limited data
Show Low Lake in Navajo County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 186 acres.
- Max depth
- ~16 ft est.
- Area
- 186 acres
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Show Low Lake’s letter
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Why Show Low 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 Show Low 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.
Show Low Lake is a 186-acre lake in Navajo County, Arizona with an estimated average depth of about 16 feet. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2025-11-05. Grade methodology: LakeQuality methodology.
What Show Low 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 Show Low 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 | ~16 ft est. |
| Surface Area | 186 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 Show Low 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
- Show Low LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Show Low Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -20 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Show Low Lake is a man-made reservoir impounded by the Jaques (completed 1953), built primarily for other on the Show Low Creek; earth-type dam, 81 ft tall and 1,970 ft long.
- Surface area
- 186 ac
- Normal storage
- 6,000 ac-ft
- Max storage
- 8,160 ac-ft
- Drainage area
- 65 sq mi
- Hazard class
- High
- Owner
- CITY OF SHOW LOW
All listed purposes: Other;Recreation.
Source: USACE National Inventory of Dams, NID ID AZ00023 · Operator website
Nearby Lakes in Navajo County
Frequently asked questions about Show Low Lake
Where is Show Low Lake?
- Show Low Lake is a lake in Navajo 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 Show Low Lake?
- Show Low Lake in Navajo County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 186 acres.
Is Show Low Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Show Low Lake?
- No published bathymetric survey covers Show Low Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 16 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 186 acres.
Are there boat ramps on Show Low Lake?
- Show Low Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Show Low Lake. Public access is listed as yes.
Explore Show Low Lake across LakeQuality
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Where this data comes from
8 measurements from 1 monitoring station, 2022–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Great Lakes Environmental Center
GLEC8 samples · 2022–2025
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 300.0 ~ EPA; Determination of Inorganic Anions by Ion Chromatography
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