Navajo Lake
Kane County, UtahView mapDirections
Nutrients and algae sit mid-range for this region.
↓ down from B at the last regrade
- Mesotrophic
- Impaired · pH / acidity
- #6 of 6 in the county
- Limited data
Navajo Lake in Kane County, Utah has a water quality grade of C (Fair). Water clarity: 9.5 ft visibility. Phosphorus: 10.2 µg/L. Chlorophyll-a (algae): 3 µg/L.
- Clarity
- 9.5 ft
- Type
- Mesotrophic
- Phosphorus
- 10.2 µg/L
- Chlorophyll-a
- 3 µg/L
- Trend
- → Stable
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Stays near Navajo Lake
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Watch Navajo Lake’s letter
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Navajo Lake is a mesotrophic lake in Kane County, Utah. Water quality is graded C based on 1 sampling years through 2020. Water clarity is improving over recent sampling years. Compared to the 5 other monitored lakes in Kane County, Navajo Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2020-08-10. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The C is nutrients and algae, not a swimming clearance. Navajo Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.
Water Quality Grade: C (Fair)
Moderate clarity, visible to about 9.5 ft. Phosphorus 10.2 µg/L. Chlorophyll-a 3 µg/L. TSI 41. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.5 ft | Not graded |
| Phosphorus | 10.2 µg/L | Not graded |
| Chlorophyll-a (Algae) | 3 µg/L | Fair |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Navajo Lake
Water Quality Trend: → Stable
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.169 m/yr | 4 |
| Chlorophyll-a | ↓ Declining | +0.07 µg/L/yr | 3 |
Reservoir Info (USACE NID)
Navajo Lake is a man-made reservoir impounded by the Navajo Lake Dam (completed 1933) on the Navajo Lake Springs; earth-type dam, 15 ft tall and 2,211 ft long.
- Max storage
- 4,600 ac-ft
- Drainage area
- 6 sq mi
- Hazard class
- Low
- Owner
- DIVISION OF WILDLIFE RESOURCES
Source: USACE National Inventory of Dams, NID ID UT00631 · Operator website
EPA Impairment Status
Navajo Lake 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 UT-L-16030001-001_00 · Official waterbody report
County Ranking
Ranked #6 of 6 lakes in Kane County
Nearby Lakes in Kane County
Frequently asked questions about Navajo Lake
Where is Navajo Lake?
- Navajo Lake is a lake in Kane County, Utah. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Navajo Lake?
- Navajo Lake in Kane County, Utah has a water quality grade of C (Fair). Water clarity: 9.5 ft visibility. Phosphorus: 10.2 µg/L. Chlorophyll-a (algae): 3 µg/L.
Is Navajo Lake safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Navajo Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.
Explore Navajo Lake across LakeQuality
Planning a trip around Cedar Breaks?
Navajo Lake is about 9 miles from Cedar Breaks National Monument. 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 Cedar Breaks →More Utah Lake Rankings
Other Grade C Lakes in Utah
Mesotrophic Lakes in Utah
Where this data comes from
23 measurements from 1 monitoring station, 2014–2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX23 samples · 2014–2020
Analytical methods
- Field Measurements
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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