Sibley Lake
Sibley Lake in Natchitoches Parish County, Louisiana has a water quality grade of C (Fair). Phosphorus: 50 µg/L. Surface area: 2176 acres.
- Area
- 2,176 acres
- Type
- Eutrophic
- Public access
- Yes
Sibley Lake is a 2,176-acre productive, nutrient-rich eutrophic lake in Natchitoches Parish County, Louisiana. Water quality is graded C based on 1 sampling years through 2024. Limited fish-species data available. Public access is available with 2 public boat landings. 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. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
No clarity data. Phosphorus level: 50 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 50 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Sibley Lake
Compare lakeside cabins, hotels, and vacation rentals near Sibley Lake in Natchitoches 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 Sibley Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 2,176 acres |
| Public Access | Yes |
No bathymetric survey has been published for Sibley Lake, so its depth is not documented here.
Recreation & Access
- Oak GrovePublic
- Settle's Boat LandingSemi-private
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
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
Source: EPA ATTAINS assessment unit LA101001_00 · Official waterbody report
County Ranking
Ranked #1 of 2 lakes in Natchitoches Parish County
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. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Sibley Lake?
- Sibley Lake in Natchitoches Parish County, Louisiana has a water quality grade of C (Fair). Phosphorus: 50 µg/L. Surface area: 2176 acres.
Is Sibley Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Sibley Lake has a water quality grade of C (Fair). Always check local health department advisories before swimming.
Are there boat ramps on Sibley Lake?
- Sibley Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Oak Grove, Settle's Boat Landing. Public access is listed as yes.
Explore Sibley Lake across LakeGrade
More Louisiana Lake Rankings
Other Grade C Lakes in Louisiana
Bienville Parish County · Fair
Rapides Parish County · Fair
Vernon Parish County · Fair
Rapides Parish County · Fair
Jackson Parish County · Fair
Rapides Parish County · Fair
Eutrophic Lakes in Louisiana
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)
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