North Tenmile Lake
Coos County, OregonView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Impaired · Algal growth
- 264 ft max depth
- Limited data
North Tenmile Lake in Coos County, Oregon is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.9 ft visibility.
- Clarity
- 4.9 ft
- Max depth
- ~264 ft est.
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Stays near North Tenmile Lake
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Watch North Tenmile Lake’s letter
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Why North Tenmile Lake has no grade
North Tenmile Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, North Tenmile Lake is Not Rated — not an F. Its 4.9-foot median from 5 readings collected 2020–2023 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by Oregon DEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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. Grade methodology: LakeQuality methodology.
What North Tenmile 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. 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.
Water quality measurements for North Tenmile Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 4.9 ft. TSI 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.9 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~264 ft est. |
| Average Depth | ~56 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
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
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
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit OR_LK_1710030404_02_100222 · Official waterbody report
Graded lakes near North Tenmile Lake
North Tenmile Lake has no grade, but these lakes within a short drive do.
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. 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 North Tenmile Lake?
- North Tenmile Lake in Coos County, Oregon is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.9 ft visibility.
Is North Tenmile Lake safe to swim in?
- The letter is 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.
Explore North Tenmile Lake across LakeQuality
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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)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory