Lake Powell
Coconino County, Arizona160,784 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
Lake Powell in Coconino County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 160784 acres.
- Area
- 160,784 acres
- Public access
- Yes
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Stays near Lake Powell
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Watch Lake Powell’s letter
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Why Lake Powell 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 Powell, 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.
Lake Powell is a 160,784-acre lake in Coconino County, Arizona. Limited fish-species data available. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2026-03-29. Grade methodology: LakeQuality methodology.
What Lake Powell is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
- Camping1 public campground nearby
- Big water160,784 acres
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Lake Powell
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 | 160,784 acres |
| Public Access | Yes |
No bathymetric survey has been published for Lake Powell, so its depth is not documented here.
Recreation & Access
- Wahweap - 1Public
- Wahweap - 2Public
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Public campgrounds near Lake Powell
- Wahweap Campground2.1 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Fishing Lake Powell
Reservoir Info (USACE NID)
Lake Powell is a man-made reservoir impounded by the Glen Canyon Dam (completed 1963), built primarily for hydroelectric on the Colorado River; concrete-type dam, 710 ft tall and 1,560 ft long.
- Surface area
- 160,784 ac
- Max storage
- 25,025,826 ac-ft
- Drainage area
- 107,416.9 sq mi
- Hazard class
- High
- Owner
- BUREAU OF RECLAMATION
All listed purposes: Hydroelectric;Other;Irrigation;Recreation.
Source: USACE National Inventory of Dams, NID ID AZ10307 · Operator website
Graded lakes near Lake Powell
Lake Powell has no grade, but these lakes within a short drive do.
Nearby Lakes in Coconino County
Frequently asked questions about Lake Powell
Where is Lake Powell?
- Lake Powell is a lake in Coconino 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 Lake Powell?
- Lake Powell in Coconino County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 160784 acres.
Is Lake Powell safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Lake Powell?
- Lake Powell has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Wahweap - 1, Wahweap - 2. Public access is listed as yes.
Are there campgrounds on Lake Powell?
- Lake Powell has 1 public campground from USGS The National Map within 5 km, including Wahweap Campground. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
Explore Lake Powell across LakeQuality
Planning a trip around Glen Canyon?
Lake Powell is about 4 miles from Glen Canyon National Recreation Area. 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 Glen Canyon →More Arizona Lake Rankings
Other Lakes in Arizona
Where this data comes from
5 measurements from 1 monitoring station, 2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Great Lakes Environmental Center
GLEC5 samples · 2026
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
Named boat-access points from the USGS National Boat Ramps inventory
Public campgrounds from USGS The National Map Structures, within about 3 miles