Sibley Lake
Natchitoches Parish County, Louisiana2,176 acresView mapDirections
LDEQ publishes the water-quality measurements for Sibley Lake. Here is what has been measured.
- Eutrophic
- Impaired · Temperature
- Public access
- Limited data
Sibley Lake in Natchitoches Parish County, Louisiana has water-quality measurements published by LDEQ, shown here as reported. Phosphorus: 50 µg/L. Surface area: 2176 acres.
Sibley Lake is a 2,176-acre productive, nutrient-rich eutrophic lake in Natchitoches Parish County, Louisiana. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 1 other monitored lakes in Natchitoches Parish County, Sibley Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-05-08. Methodology: how these readings are compared.
What Sibley Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Big water2,176 acres
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. Sibley Lake is listed impaired under Clean Water Act §303(d) (IR 5) for temperature. Check local advisories before you swim.
Whether Sibley 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 Sibley Lake
These are the measurements LDEQ publishes for Sibley 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 50 µg/L. TSI 61.
| 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 | 50µg/L | Fair 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. | 61 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Sibley Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
2,176 acres
Public access
Yes
Listed by LDEQ
No bathymetric survey has been published for Sibley Lake, so its depth is not documented here.
Recreation & Access
- Settle's Boat LandingSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Stays near Sibley Lake
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Fishing Sibley Lake
Reservoir Info (USACE NID)
Sibley Lake is a man-made reservoir impounded by the Sibley Lake Dam (completed 1962), built primarily for water supply on the Youngs Bayou; earth-type dam, 36 ft tall and 6,045 ft long.
- Surface area
- 2,176 ac
- Normal storage
- 19,500 ac-ft
- Max storage
- 56,700 ac-ft
- Drainage area
- 40 sq mi
- Hazard class
- High
- Owner
- City of Natchitoches
Source: USACE National Inventory of Dams, NID ID LA00027 · Operator website
EPA Impairment Status
Sibley 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: Recreation.
Source: EPA ATTAINS assessment unit LA101001_00 · Official waterbody report
Nearby Lakes in Natchitoches Parish County
Frequently asked questions about Sibley Lake
Where is Sibley Lake?
- Sibley Lake is a lake in Natchitoches Parish County, Louisiana. Its water-quality measurements are published by LDEQ and shown on this page as reported.
What is the water quality of Sibley Lake?
- Sibley Lake in Natchitoches Parish County, Louisiana has water-quality measurements published by LDEQ, shown here as reported. Phosphorus: 50 µg/L. Surface area: 2176 acres.
Is Sibley Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Sibley Lake is listed impaired under Clean Water Act §303(d) (IR 5) for temperature. Check local advisories before you swim.
Are there boat ramps on Sibley Lake?
- Sibley Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Settle's Boat Landing. Public access is listed as yes.
Can I fish at Sibley Lake?
- Sibley Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. 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
35 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_WQX35 samples · 2020–2024
Analytical methods
- Total Phosphorus After Block Digestion
- 2130 B ~ Nephelometric Method
- 2120 B ~ Color in Water by Visual Comparison
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
Named boat-access points from the USGS National Boat Ramps inventory