Gravelly Lake
Pierce County, WashingtonView mapDirections
Washington Ecology publishes the water-quality measurements for Gravelly Lake. Here is what has been measured.
- 32 ft max depth
- Limited data
Gravelly Lake in Pierce County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Water clarity: 25.4 ft visibility.
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. Methodology: how these readings are compared.
What Gravelly Lake is good for
From access and monitoring records, not editorial picks.
- Clear water25.4 ft of visibility
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Gravelly Lake is safe to swim in today is a call for the Washington State Department of Ecology and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Gravelly Lake
These are the measurements Washington Ecology publishes for Gravelly Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 25.4 ft down. TSI 30.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 25.4ft | 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. | 30 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Gravelly Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~32 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
Watershed (drainage) area
0 sq mi
HydroLAKES / HydroSHEDS
Surface area
131 acres
HydroLAKES / HydroSHEDS
Shoreline
1.8 mi
HydroLAKES / HydroSHEDS
Elevation
230 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.
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Stays near Gravelly Lake
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Fishing Gravelly Lake
Water Quality Trend: Stable
Based on 7 years of monitoring (2012–2022).
Water clarity
Stable7 years
Nearby Lakes in Pierce County
Frequently asked questions about Gravelly Lake
Where is Gravelly Lake?
- Gravelly Lake is a lake in Pierce County, Washington. Its water-quality measurements are published by Washington Ecology and shown on this page as reported.
What is the water quality of Gravelly Lake?
- Gravelly Lake in Pierce County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Water clarity: 25.4 ft visibility.
Is Gravelly Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. 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.
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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)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)