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LakeQuality

Sibley Lake

Natchitoches Parish County, Louisiana2,176 acresView mapDirections

LDEQ publishes the water-quality measurements for Sibley Lake. Here is what has been measured.

Phosphorus
50 µg/L
Less phosphorus than most
Measured by LDEQ
Area
2,176 acres
Surface area
Type
Eutrophic
Trophic class
  • Eutrophic
  • Impaired · Temperature
  • Public access
  • Limited data
See the measurementsDirectionsWhere to stay

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.

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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 only

Recreation 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.

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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.

Water quality readings
MeasureReadingWhere it sits
Water clarity (Secchi depth)No reading

How deep a black-and-white disk stays visible from the surface. Higher is clearer.

Total phosphorus50µg/LFair
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.61Eutrophic
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

1
Boat Landings
Yes
Public 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

Stays via Stay22

Stays 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

Prices for Oct 9–11, 4 adults. Change dates on the map below.

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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

Temperature

Designated uses not supporting: Recreation.

Source: EPA ATTAINS assessment unit LA101001_00 · Official waterbody report

Nearby Lakes in Natchitoches Parish County

Black Lake North of Natchitoches14.4 miView →Chaplin Lake—View →Murphys Lake—View →Passoit Lake—View →Saint Maurice Lake—View →Dunn Lake—View →

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.

Measurements on this page ↑

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.

Swimming on this page ↑

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.

Access on this page ↑

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.

Access on this page ↑

Explore Sibley Lake across LakeQuality

Lake Fishing Forecast

Species activity outlook by water temperature and season

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Every Louisiana lake with its LDEQ measurements

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Nantachie Creek Southeast of Montgomery LakeKepler Creek Lake Southeast of JamestownCotile Lake West of AlexandriaVernon Lake Northeast of Standard

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