Navajo Lake
Kane County, UtahView mapDirections
Utah DWQ publishes the water-quality measurements for Navajo Lake. Here is what has been measured.
- Mesotrophic
- Impaired · pH / acidity
- Limited data
Navajo Lake in Kane County, Utah has water-quality measurements published by Utah DWQ, shown here as reported. Water clarity: 9.5 ft visibility. Phosphorus: 10.2 µg/L. Chlorophyll-a (algae): 3 µg/L.
Navajo Lake is a mesotrophic lake in Kane County, Utah. 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. Methodology: how these readings are compared.
For a place on the water, look through cabin and lake-house rentals near Navajo Lake on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are 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.
Whether Navajo Lake is safe to swim in today is a call for the Utah Division of Water Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Navajo Lake
These are the measurements Utah DWQ publishes for Navajo Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 9.5 ft. Phosphorus 10.2 µg/L. Chlorophyll-a 3 µg/L. TSI 41.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 9.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 10.2µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 3µg/L | Fair GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 41 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
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Stays near Navajo Lake
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Fishing Navajo Lake
Water Quality Trend: Stable
Based on 4 years of monitoring (2012–2020).
Water clarity
Improving4 years
Chlorophyll-a
Worsening+0.07 µg/L/yr3 years
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
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit UT-L-16030001-001_00 · Official waterbody report
Nearby Lakes in Kane County
Frequently asked questions about Navajo Lake
Where is Navajo Lake?
- Navajo Lake is a lake in Kane County, Utah. Its water-quality measurements are published by Utah DWQ and shown on this page as reported.
What is the water quality of Navajo Lake?
- Navajo Lake in Kane County, Utah has water-quality measurements published by Utah DWQ, shown here as reported. Water clarity: 9.5 ft visibility. Phosphorus: 10.2 µg/L. Chlorophyll-a (algae): 3 µg/L.
Is Navajo Lake safe to swim in?
- Nutrient and algae readings are 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 lakes in Utah
Other 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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database