Lake Conroe
Montgomery County, TexasView mapDirections
Nutrients and algae run above the regional average.
- Eutrophic
- #1 of 1 in the county
- 47 ft max depth
- Public access
Lake Conroe in Montgomery County, Texas has a water quality grade of D (Nutrient-rich). Water clarity: 2.2 ft visibility. Phosphorus: 70 µg/L.
- Clarity
- 2.2 ft
- Max depth
- ~47 ft est.
- Type
- Eutrophic
- Phosphorus
- 70 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Stays near Lake Conroe
Compare lakeside cabins, hotels, and vacation rentals near Lake Conroe in Montgomery County, Texas — 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Lake Conroe are listed below.
Top-rated places to stay near Lake Conroe
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Lake Conroe is a productive, nutrient-rich eutrophic lake in Montgomery County, Texas with an estimated average depth of about 47 feet. Water quality is graded D based on 1 sampling years through 2023. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 28 public boat landings.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2023-12-21. Grade methodology: LakeQuality methodology.
What Lake Conroe is good for
From access and monitoring records, not editorial picks.
- Boat launch28 documented ramps
Swimming Safety
Grade onlyElevated nutrients
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 D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 2.2 ft of visibility. Phosphorus 70 µg/L. TSI 65. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.2 ft | Not graded |
| Phosphorus | 70 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~47 ft est. |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Texas has not published bathymetry for Lake Conroe.
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.
Recreation & Access
- Nautical Boat Club - MontgomeryPublic
- Road 830Public
- Road 204Public
- Sam Houston National Forest - Scott’s RidgePublic
- Lakeview MarinaSemi-private
- Piney Shores BoatSemi-private
Showing 6 of 28 documented landings from the USGS National Boat Ramps inventory.
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Conroe
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.053 m/yr | 4 |
| Phosphorus | → Stable | +0.36 µg/L/yr | 3 |
County Ranking
Ranked #1 of 1 lakes in Montgomery County
Nearby Lakes in Montgomery County
Frequently asked questions about Lake Conroe
Where is Lake Conroe?
- Lake Conroe is a lake in Montgomery County, Texas. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Conroe?
- Lake Conroe in Montgomery County, Texas has a water quality grade of D (Nutrient-rich). Water clarity: 2.2 ft visibility. Phosphorus: 70 µg/L.
Is Lake Conroe safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Lake Conroe?
- No published bathymetric survey covers Lake Conroe, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 47 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Lake Conroe?
- Lake Conroe has 28 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Nautical Boat Club - Montgomery, Road 830, Road 204, Sam Houston National Forest - Scott’s Ridge, among others. Public access is listed as yes.
Explore Lake Conroe across LakeQuality
Depth, room, public access, and the state wake-sport rules
Species activity outlook by water temperature and season
Where to stay at Texas's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
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More Texas Lake Rankings
Other Grade D Lakes in Texas
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Where this data comes from
110 measurements from 7 monitoring stations, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Texas Water Science Center
USGS-TX110 samples · 2020–2023
Monitoring station identifiers (7)
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)
Named boat-access points from the USGS National Boat Ramps inventory