Capitol Lake
East Baton Rouge Parish County, LouisianaView mapDirections
LDEQ publishes the water-quality measurements for Capitol Lake. Here is what has been measured.
- Hypereutrophic
- Impaired · PCBs
- Public access
Capitol Lake in East Baton Rouge Parish County, Louisiana has water-quality measurements published by LDEQ, shown here as reported. Phosphorus: 310 µg/L.
Capitol Lake is a highly nutrient-loaded hypereutrophic lake in East Baton Rouge Parish County, Louisiana. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-10-08. Methodology: how these readings are compared.
Swimming conditions
Readings onlyRecreation use not supported
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Capitol Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pCBs, temperature. Check local advisories before you swim.
Whether Capitol Lake is safe to swim in today is a call for the Louisiana Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Capitol Lake
These are the measurements LDEQ publishes for Capitol Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 310 µg/L. TSI 87.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 310µg/L | Poor GoodFairPoor |
| 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. | 87 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Capitol Lake
Answers come straight from the public measurements and survey records on this page.
Stays via Stay22
Stays near Capitol Lake
Compare lakeside cabins, hotels, and vacation rentals near Capitol Lake in East Baton Rouge 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Capitol Lake are listed below.
Top-rated places to stay near Capitol Lake
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Fishing Capitol Lake
EPA Impairment Status
Capitol Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit LA070503_00 · Official waterbody report
Nearby Lakes in East Baton Rouge Parish County
Frequently asked questions about Capitol Lake
Where is Capitol Lake?
- Capitol Lake is a lake in East Baton Rouge Parish County, Louisiana. Its water-quality measurements are published by LDEQ and shown on this page as reported.
What is the water quality of Capitol Lake?
- Capitol Lake in East Baton Rouge Parish County, Louisiana has water-quality measurements published by LDEQ, shown here as reported. Phosphorus: 310 µg/L.
Is Capitol Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Capitol Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pCBs, temperature. Check local advisories before you swim.
Can I fish at Capitol Lake?
- Public access to Capitol Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Louisiana's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
37 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- LDEQ/Water Planning and Assessment (Louisiana)
LADEQWPD_WQX37 samples · 2020–2024
Analytical methods
- Total Phosphorus After Block Digestion
- 2130 B ~ Nephelometric Method
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
Impairment status from EPA ATTAINS 303(d) database