Bonnet Carre Lake
Bonnet Carre Lake in St. Charles Parish County, Louisiana is not rated for water quality — its monitoring record does not meet the evidence bar.
- Public access
- Yes
Why Bonnet Carre Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Bonnet Carre Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Bonnet Carre Lake is a lake in St. Charles Parish County, Louisiana. Limited fish-species data available. Public access is available with 3 public boat landings.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2020-04-16. Grade methodology: LakeGrade methodology.
Watch Bonnet Carre Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedBacteria advisory
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Bonnet Carre Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Where to stay near Bonnet Carre Lake
Compare lakeside cabins, hotels, and vacation rentals near Bonnet Carre Lake in St. Charles Parish County, Louisiana — 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.
Top-rated places to stay near Bonnet Carre Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Recreation & Access
- Bonnet Carre SpillwayPublic
- Bonnet CarrePublic
- Bonnet Carre SpillwayPublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fishing Bonnet Carre Lake
EPA Impairment Status
Bonnet Carre Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit LA041101_00 · Official waterbody report · Matched by proximity (0.47 km)
Graded lakes near Bonnet Carre Lake
Bonnet Carre Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in St. Charles Parish County
Frequently asked questions about Bonnet Carre Lake
Where is Bonnet Carre Lake?
- Bonnet Carre Lake is a lake in St. Charles Parish County, Louisiana. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Bonnet Carre Lake?
- Bonnet Carre Lake in St. Charles Parish County, Louisiana is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Bonnet Carre Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Bonnet Carre Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Bonnet Carre Lake?
- Bonnet Carre Lake has 3 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Bonnet Carre Spillway, Bonnet Carre, Bonnet Carre Spillway. Public access is listed as yes.
Explore Bonnet Carre Lake across LakeGrade
More Louisiana Lake Rankings
Other Lakes in Louisiana
St. John the Baptist Parish County · Not rated
St. John the Baptist Parish County · Not rated
St. John the Baptist Parish County · Not rated
St. John the Baptist Parish County · Not rated
St. John the Baptist Parish County · Not rated
St. John the Baptist Parish County · Not rated
Where this data comes from
7 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- USGS Louisiana Water Science Center
USGS-LA7 samples · 2020
Analytical methods
- Secchi disk method
- P, wu, WCA, persulfate CF color
- Plant pigments, sonication & 445
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