Bonney 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 · Nuisance exotic species
- Public access
- Limited data
Bonney Lake in Pierce County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.2 ft visibility.
- Clarity
- 5.2 ft
- Trend
- ↓ Declining
- Public access
- Yes
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Stays near Bonney Lake
Compare lakeside cabins, hotels, and vacation rentals near Bonney Lake in Pierce County, Washington — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Watch Bonney Lake’s letter
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Why Bonney Lake has no grade
Bonney 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, Bonney Lake is Not Rated — not an F. Its 5.2-foot median from 2 readings collected 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.
Bonney Lake is a lake in Pierce County, Washington. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, WA Ecology, last sampled 2022-07-10. Grade methodology: LakeQuality methodology.
What Bonney 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. Bonney Lake is listed impaired under Clean Water Act §303(d) (IR 4C) for nuisance exotic species. Check local advisories before you swim.
Water quality measurements for Bonney Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 5.2 ft. TSI 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.2 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Recreation & Access
- Bonney LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Bonney Lake
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.027 m/yr | 4 |
EPA Impairment Status
Bonney Lake is officially listed as impaired under Clean Water Act §303(d) in the 2018 EPA reporting cycle (IR category 4C).
Causes of impairment
Source: EPA ATTAINS assessment unit WA17110014001179_001_001 · Official waterbody report · Matched by proximity (2.55 km)
Nearby Lakes in Pierce County
Frequently asked questions about Bonney Lake
Where is Bonney Lake?
- Bonney Lake is a lake in Pierce County, Washington. 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 Bonney Lake?
- Bonney Lake in Pierce County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.2 ft visibility.
Is Bonney Lake safe to swim in?
- The letter is not a swimming clearance. Bonney Lake is listed impaired under Clean Water Act §303(d) (IR 4C) for nuisance exotic species. Check local advisories before you swim.
Are there boat ramps on Bonney Lake?
- Bonney Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Bonney Lake. Public access is listed as yes.
Explore Bonney Lake across LakeQuality
Planning a trip around Mount Rainier?
Bonney Lake is about 32 miles from Mount Rainier National Park. 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 Mount Rainier →More Washington Lake Rankings
Other Lakes in Washington
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Where this data comes from
2 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS2 samples · 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
Named boat-access points from the USGS National Boat Ramps inventory