Lake Alan Henry
Garza County, Texas2,884 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
↑ up from B at the last regrade
- Mesotrophic
- Impaired · Mercury
- #1 of 1 in the county
- 75 ft max depth
- Public access
- Limited data
Lake Alan Henry in Garza County, Texas has a water quality grade of A (Excellent). Water clarity: 9.4 ft visibility. Phosphorus: 91.4 µg/L. Chlorophyll-a (algae): 2.6 µg/L. Surface area: 2884 acres.
- Clarity
- 9.4 ft
- Max depth
- ~75 ft est.
- Area
- 2,884 acres
- Type
- Mesotrophic
- Phosphorus
- 91.4 µg/L
- Chlorophyll-a
- 2.6 µg/L
- Trend
- → Stable
- Public access
- Yes
Stays via Stay22
Stays near Lake Alan Henry
Compare lakeside cabins, hotels, and vacation rentals near Lake Alan Henry in Garza 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.
Top-rated places to stay near Lake Alan Henry
Prices for Sep 11–13, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip? Cabins and lodging at Lake Alan Henry → · more Texas lake trips
Watch Lake Alan Henry’s letter
Email me if this lake’s grade moves. Grades stay free.
Or email
Lake Alan Henry is a 2,884-acre mesotrophic lake in Garza County, Texas with an estimated average depth of about 75 feet. Water quality is graded A based on 1 sampling years through 2025. Water clarity is improving over recent sampling years. Limited fish-species data available. Public access is available with 6 public boat landings.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2025-11-03. Grade methodology: LakeQuality methodology.
What Lake Alan Henry is good for
From access and monitoring records, not editorial picks.
- Boat launch6 documented ramps
- Big water2,884 acres
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.
The A is nutrients and algae, not a swimming clearance. Lake Alan Henry is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Moderate clarity, visible to about 9.4 ft. Phosphorus 91.4 µg/L. Chlorophyll-a 2.6 µg/L. TSI 51. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.4 ft | Not graded |
| Phosphorus | 91.4 µg/L | Not graded |
| Chlorophyll-a (Algae) | 2.6 µg/L | Good |
| Trophic State Index (TSI) | 51 | Mesotrophic |
Moderate nutrients, good water quality
Current Conditions
USGS snapshot Sep 7, 2026, 3:30 PM from gauge 08079700 (Lk Alan Henry Res nr Justiceburg, TX). Station page ↗ — a live reading replaces this snapshot when the gauge responds. Missing live data is not an all-clear.
→ Lake Alan Henry water level: the live USGS gauge reading
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~75 ft est. |
| Surface Area | 2,884 acres |
| 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 Alan Henry.
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
- Sam Wahl Recreation AreaPublic
- North Ridge Drive - Lake Alan HenryPublic
- Lake Alan HenryPublic
- Lake Alan HenryPublic
- Dam SitePublic
- Oak Canyon EstatesPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Alan Henry
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.244 m/yr | 6 |
| Phosphorus | ↓ Declining | +39.73 µg/L/yr | 2 |
| Chlorophyll-a | → Stable | -0.01 µg/L/yr | 5 |
Reservoir Info (USACE NID)
Lake Alan Henry is a man-made reservoir impounded by the John T Montford Dam (completed 1994), built primarily for irrigation on the Double Mountain Fork Brazos R; earth-type dam, 141 ft tall and 4,150 ft long.
- Surface area
- 2,884 ac
- Normal storage
- 115,937 ac-ft
- Max storage
- 354,500 ac-ft
- Drainage area
- 394 sq mi
- Hazard class
- High
- Owner
- CITY OF LUBBOCK
All listed purposes: Irrigation;Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID TX06464 · Operator website · Matched by proximity (0.46 km)
EPA Impairment Status
Lake Alan Henry 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 TX-1241B_01 · Official waterbody report
County Ranking
Ranked #1 of 1 lakes in Garza County
Nearby Lakes in Garza County
Frequently asked questions about Lake Alan Henry
Where is Lake Alan Henry?
- Lake Alan Henry is a lake in Garza County, Texas. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Alan Henry?
- Lake Alan Henry in Garza County, Texas has a water quality grade of A (Excellent). Water clarity: 9.4 ft visibility. Phosphorus: 91.4 µg/L. Chlorophyll-a (algae): 2.6 µg/L. Surface area: 2884 acres.
Is Lake Alan Henry safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Lake Alan Henry is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Lake Alan Henry?
- No published bathymetric survey covers Lake Alan Henry, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 75 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 2884 acres.
What is the water level at Lake Alan Henry?
- The USGS snapshot on this page for Lake Alan Henry is 2209.06 ft of water-surface elevation, recorded Sep 7, 2026, 3:30 PM at gauge 08079700. Current Conditions hydrates a live NWIS reading from that same station when the gauge responds. A missed live fetch is not an all-clear.
Are there boat ramps on Lake Alan Henry?
- Lake Alan Henry has 6 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Sam Wahl Recreation Area, North Ridge Drive - Lake Alan Henry, Lake Alan Henry, Lake Alan Henry, among others. Public access is listed as yes.
Explore Lake Alan Henry across LakeQuality
More Texas Lake Rankings
Other Grade A Lakes in Texas
Mesotrophic Lakes in Texas
Where this data comes from
34 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Texas Commission on Environmental Quality
TCEQMAIN34 samples · 2020–2025
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory