Inlb Lake
Blount County, AlabamaView mapDirections
ADEM publishes the water-quality measurements for Inlb Lake. Here is what has been measured.
- Mesotrophic
- Impaired · Mercury
- 71 ft max depth
Inlb Lake in Blount County, Alabama has water-quality measurements published by ADEM, shown here as reported. Water clarity: 11.9 ft visibility. Phosphorus: 12 µg/L. Chlorophyll-a (algae): 2.8 µg/L.
Inlb Lake is a mesotrophic lake in Blount County, Alabama with an estimated average depth of about 71 feet. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, ADEM, last sampled 2024-09-18. Methodology: how these readings are compared.
What Inlb Lake is good for
From access and monitoring records, not editorial picks.
- Clear water11.9 ft of visibility
Swimming conditions
Readings onlyLow algae
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. Inlb Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Inlb Lake is safe to swim in today is a call for the Alabama Department of Environmental Management and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Inlb Lake
These are the measurements ADEM publishes for Inlb Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 11.9 ft. Phosphorus 12 µg/L. Chlorophyll-a 2.8 µg/L. TSI 41.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 11.9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 12µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 2.8µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 41 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Inlb Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~71 ft est.
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Alabama has not published bathymetry for Inlb Lake.
Lake Size & Watershed
Watershed (drainage) area
64 sq mi
HydroLAKES / HydroSHEDS
Surface area
1,213 acres
HydroLAKES / HydroSHEDS
Shoreline
22.5 mi
HydroLAKES / HydroSHEDS
Elevation
791 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Stays via Stay22
Stays near Inlb Lake
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Fishing Inlb Lake
Water Quality Trend: Worsening
Based on 4 years of monitoring (2012–2024).
Water clarity
Worsening4 years
Phosphorus
Worsening+0.27 µg/L/yr4 years
Chlorophyll-a
Worsening+0.07 µg/L/yr4 years
Reservoir Info (USACE NID)
Inlb Lake is a man-made reservoir impounded by the Inland Lake, built primarily for recreation on the Blackburn Fork Little Warrior River; rockfill-type dam.
- Normal storage
- 0 ac-ft
- Hazard class
- High
- Owner
- BIRMINGHAM CITY OF
All listed purposes: Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID AL01167 · Operator website · Matched by proximity (0.23 km)
EPA Impairment Status
Inlb Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption.
Source: EPA ATTAINS assessment unit AL03160111-0204-111 · Official waterbody report
Nearby Lakes in Blount County
Frequently asked questions about Inlb Lake
Where is Inlb Lake?
- Inlb Lake is a lake in Blount County, Alabama. Its water-quality measurements are published by ADEM and shown on this page as reported.
What is the water quality of Inlb Lake?
- Inlb Lake in Blount County, Alabama has water-quality measurements published by ADEM, shown here as reported. Water clarity: 11.9 ft visibility. Phosphorus: 12 µg/L. Chlorophyll-a (algae): 2.8 µg/L.
Is Inlb Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Inlb Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Inlb Lake?
- No published bathymetric survey covers Inlb Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 71 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Inlb Lake across LakeQuality
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Mesotrophic Lakes in Alabama
Where this data comes from
94 measurements from 1 monitoring station, 2012–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- ALABAMA DEPT. OF ENVIRONMENTAL MANAGEMENT - WATER QUALITY DATA
21AWIC94 samples · 2012–2024
Analytical methods
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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
Lake size & watershed from HydroLAKES (HydroSHEDS)