Alamo Lake
La Paz County, Arizona41,500 acresView mapDirections
No nutrient or algae sampling on record from ADEQ for this lake.
- 66 ft max depth
- Public access
- Limited data
Alamo Lake in La Paz County, Arizona has water-quality measurements published by ADEQ, shown here as reported. Surface area: 41500 acres.
Alamo Lake is a 41,500-acre lake in La Paz County, Arizona with an estimated average depth of about 66 feet. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2026-03-25. Methodology: how these readings are compared.
At about 42,000 acres, Alamo Lake is large enough that where you stay decides which shore you see most of. Vrbo is where to look for cabins and lake homes around Alamo Lake, and Booking.com and Expedia search hotels near the lake for your dates.
What Alamo Lake is good for
From access and monitoring records, not editorial picks.
- Big water41,500 acres
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Alamo Lake is safe to swim in today is a call for the Arizona Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Alamo Lake
These are the measurements ADEQ publishes for Alamo 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.
Ask about Alamo Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~66 ft est.
Surface area
41,500 acres
Public access
Yes
Listed by ADEQ
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Arizona has not published bathymetry for Alamo Lake.
Lake Size & Watershed
Watershed (drainage) area
4,620 sq mi
HydroLAKES / HydroSHEDS
Shoreline
13.8 mi
HydroLAKES / HydroSHEDS
Elevation
1,119 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 Alamo Lake
Compare lakeside cabins, hotels, and vacation rentals near Alamo Lake in La Paz County, Arizona — 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 Alamo Lake
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
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Planning a trip? Cabins and lodging at Alamo Lake → · more Arizona lake trips
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Fishing Alamo Lake
Water quality readings over time
2 seasons of samples on record (2012–2013). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening2 years
Reservoir Info (USACE NID)
Alamo Lake is a man-made reservoir impounded by the Alamo Dam (completed 1968), built primarily for flood risk reduction on the Bill Williams River; earth-type dam, 283 ft tall and 975 ft long.
- Surface area
- 41,500 ac
- Normal storage
- 0 ac-ft
- Max storage
- 1,409,000 ac-ft
- Drainage area
- 4,770 sq mi
- Hazard class
- High
- Owner
- USACE - Los Angeles District
All listed purposes: Flood Risk Reduction;Fish and Wildlife Pond;Recreation.
Source: USACE National Inventory of Dams, NID ID AZ82203 · Operator website
Nearby Lakes in La Paz County
Frequently asked questions about Alamo Lake
Where is Alamo Lake?
- Alamo Lake is a lake in La Paz County, Arizona. Its water-quality measurements are published by ADEQ and shown on this page as reported.
What is the water quality of Alamo Lake?
- Alamo Lake in La Paz County, Arizona has water-quality measurements published by ADEQ, shown here as reported. Surface area: 41500 acres.
Is Alamo Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Alamo Lake?
- No published bathymetric survey covers Alamo Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 66 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 41500 acres.
Can I fish at Alamo Lake?
- Public access to Alamo Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Arizona's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
7 measurements from 2 monitoring stations, 2025–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Great Lakes Environmental Center
GLEC5 samples · 2026 - AZDEQ_SW
AZDEQ_SW2 samples · 2025
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 300.0 ~ EPA; Determination of Inorganic Anions by Ion Chromatography
- EPA 365.1
- FIELD
Monitoring station identifiers (2)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)