Gravelly Lake
Pierce County, WashingtonView 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 · Nutrients (phosphorus, nitrogen)
- 32 ft max depth
- Limited data
Gravelly Lake in Pierce County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 25.4 ft visibility.
- Clarity
- 25.4 ft
- Max depth
- ~32 ft est.
- Trend
- → Stable
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Stays near Gravelly Lake
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Watch Gravelly Lake’s letter
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Why Gravelly Lake has no grade
Gravelly 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, Gravelly Lake is Not Rated — not an F. Its 25.4-foot median from 7 readings collected 2012–2022 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 WA Ecology and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Gravelly Lake is a lake in Pierce County, Washington with an estimated average depth of about 32 feet.
Source: EPA Water Quality Portal sampling records, WA Ecology, last sampled 2022-07-22. Grade methodology: LakeQuality methodology.
What Gravelly Lake is good for
From access and monitoring records, not editorial picks.
- Clear water25.4 ft of visibility
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Gravelly Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Water quality measurements for Gravelly Lake
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 25.4 ft down. TSI 30.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 25.4 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 30 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~32 ft est. |
| Average Depth | ~18 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Washington has not published bathymetry for Gravelly 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.
Fishing Gravelly Lake
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.08 m/yr | 7 |
EPA Impairment Status
Gravelly Lake is officially listed as impaired under Clean Water Act §303(d) in the 2018 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WA17110019001212_001_001 · Official waterbody report · Matched by proximity (2.11 km)
Graded lakes near Gravelly Lake
Gravelly Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Pierce County
Frequently asked questions about Gravelly Lake
Where is Gravelly Lake?
- Gravelly Lake is a lake in Pierce County, Washington. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Gravelly Lake?
- Gravelly Lake in Pierce County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 25.4 ft visibility.
Is Gravelly Lake safe to swim in?
- The letter is not a swimming clearance. Gravelly Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Gravelly Lake?
- No published bathymetric survey covers Gravelly Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 32 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Gravelly Lake across LakeQuality
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Where this data comes from
7 measurements from 1 monitoring station, 2012–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS7 samples · 2012–2022
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)