Inlb Lake
Blount County, AlabamaView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- #1 of 1 in the county
- 71 ft max depth
Inlb Lake in Blount County, Alabama has a water quality grade of A (Excellent). Water clarity: 11.9 ft visibility. Phosphorus: 12 µg/L. Chlorophyll-a (algae): 2.8 µg/L.
- Clarity
- 11.9 ft
- Max depth
- ~71 ft est.
- Type
- Mesotrophic
- Phosphorus
- 12 µg/L
- Chlorophyll-a
- 2.8 µg/L
- Trend
- ↓ Declining
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Watch Inlb Lake’s letter
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Inlb Lake is a mesotrophic lake in Blount County, Alabama with an estimated average depth of about 71 feet. Water quality is graded A based on 2 sampling years through 2024. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, ADEM, last sampled 2024-09-18. Grade methodology: LakeQuality methodology.
What Inlb Lake is good for
From access and monitoring records, not editorial picks.
- Clear water11.9 ft of visibility
Swimming Safety
Grade onlyLow algae
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.
The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Good clarity, visible to about 11.9 ft. Phosphorus 12 µg/L. Chlorophyll-a 2.8 µg/L. TSI 41. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.9 ft | Not graded |
| Phosphorus | 12 µg/L | Good |
| Chlorophyll-a (Algae) | 2.8 µg/L | Good |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~71 ft est. |
| Average Depth | ~69 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
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.
Fishing Inlb Lake
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.1 m/yr | 4 |
| Phosphorus | ↓ Declining | +0.27 µg/L/yr | 4 |
| Chlorophyll-a | ↓ Declining | +0.07 µg/L/yr | 4 |
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)
County Ranking
Ranked #1 of 1 lakes in Blount County
Nearby Lakes in Blount County
Frequently asked questions about Inlb Lake
Where is Inlb Lake?
- Inlb Lake is a lake in Blount County, Alabama. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Inlb Lake?
- Inlb Lake in Blount County, Alabama has a water quality grade of A (Excellent). Water clarity: 11.9 ft visibility. Phosphorus: 12 µg/L. Chlorophyll-a (algae): 2.8 µg/L.
Is Inlb Lake safe to swim in?
- The A is nutrients and algae, not a swimming clearance. 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
More Alabama Lake Rankings
Other Grade A Lakes in Alabama
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)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)