North Tenmile Lake
Coos County, OregonView mapDirections
Oregon DEQ publishes the water-quality measurements for North Tenmile Lake. Here is what has been measured.
- Impaired · Algal growth
- 264 ft max depth
- Limited data
North Tenmile Lake in Coos County, Oregon has water-quality measurements published by Oregon DEQ, shown here as reported. Water clarity: 4.9 ft visibility.
North Tenmile Lake is a lake in Coos County, Oregon with an estimated average depth of about 264 feet. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Oregon DEQ, last sampled 2023-10-05. Methodology: how these readings are compared.
What North Tenmile Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. North Tenmile Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury, noxious aquatic plants, oxygen depletion (low DO), sediment / turbidity. Check local advisories before you swim.
Whether North Tenmile Lake is safe to swim in today is a call for the Oregon Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for North Tenmile Lake
These are the measurements Oregon DEQ publishes for North Tenmile Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 4.9 ft. TSI 54.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 54 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about North Tenmile Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~264 ft est.
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Oregon has not published bathymetry for North Tenmile Lake.
Lake Size & Watershed
Watershed (drainage) area
30 sq mi
HydroLAKES / HydroSHEDS
Surface area
645 acres
HydroLAKES / HydroSHEDS
Shoreline
16.4 mi
HydroLAKES / HydroSHEDS
Elevation
20 ft
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
- Sunlake MarinaSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Stays near North Tenmile Lake
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Fishing North Tenmile Lake
EPA Impairment Status
North Tenmile Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Drinking water, Aquatic life, Fish consumption, Recreation, Other.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit OR_LK_1710030404_02_100222 · Official waterbody report
Nearby Lakes in Coos County
Frequently asked questions about North Tenmile Lake
Where is North Tenmile Lake?
- North Tenmile Lake is a lake in Coos County, Oregon. Its water-quality measurements are published by Oregon DEQ and shown on this page as reported.
What is the water quality of North Tenmile Lake?
- North Tenmile Lake in Coos County, Oregon has water-quality measurements published by Oregon DEQ, shown here as reported. Water clarity: 4.9 ft visibility.
Is North Tenmile Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. North Tenmile Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury, noxious aquatic plants, oxygen depletion (low DO), sediment / turbidity. Check local advisories before you swim.
How deep is North Tenmile Lake?
- No published bathymetric survey covers North Tenmile Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 264 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on North Tenmile Lake?
- North Tenmile Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Sunlake Marina.
Can I fish at North Tenmile Lake?
- North Tenmile Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Oregon's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
5 measurements from 1 monitoring station, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS5 samples · 2020–2023
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory