Lake Del Valle
Alameda County, California710 acresView mapDirections
SWRCB publishes the water-quality measurements for Lake Del Valle. Here is what has been measured.
- Public access
- Limited data
Lake Del Valle in Alameda County, California has water-quality measurements published by SWRCB, shown here as reported. Water clarity: 7 ft visibility. Surface area: 710 acres.
Lake Del Valle is a 710-acre lake in Alameda County, California. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-07-28. Methodology: how these readings are compared.
What Lake Del Valle is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lake Del Valle is safe to swim in today is a call for the California State Water Resources Control Board and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Del Valle
These are the measurements SWRCB publishes for Lake Del Valle, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 7 ft. TSI 49.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 7ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 49 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Lake Del Valle
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
710 acres
Public access
Yes
Listed by SWRCB
No bathymetric survey has been published for Lake Del Valle, so its depth is not documented here.
Recreation & Access
- Del Valle LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Lake Del Valle
Compare lakeside cabins, hotels, and vacation rentals near Lake Del Valle in Alameda County, California — 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 Del Valle
Prices for Oct 9–11, 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.
Follow Lake Del Valle’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Lake Del Valle
Reservoir Info (USACE NID)
Lake Del Valle is a man-made reservoir impounded by the Del Valle (completed 1968), built primarily for flood risk reduction on the Arroyo Valle; earth-type dam, 222 ft tall and 880 ft long.
- Surface area
- 710 ac
- Max storage
- 77,100 ac-ft
- Drainage area
- 146 sq mi
- Hazard class
- High
- Owner
- California Department of Water Resources
All listed purposes: Flood Risk Reduction;Irrigation;Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID CA00043 · Operator website
Nearby Lakes in Alameda County
Frequently asked questions about Lake Del Valle
Where is Lake Del Valle?
- Lake Del Valle is a lake in Alameda County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Lake Del Valle?
- Lake Del Valle in Alameda County, California has water-quality measurements published by SWRCB, shown here as reported. Water clarity: 7 ft visibility. Surface area: 710 acres.
Is Lake Del Valle safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Lake Del Valle?
- Lake Del Valle has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Del Valle Lake. Public access is listed as yes.
Can I fish at Lake Del Valle?
- Lake Del Valle has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by California's fish and wildlife agency, so check its current regulations before you go.
Explore Lake Del Valle across LakeQuality
More lakes in California
Other Lakes in California
Mesotrophic Lakes in California
Where this data comes from
5 measurements from 1 monitoring station, 2022–2023. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- North American Lake Management Society
NALMS5 samples · 2022–2023
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
Named boat-access points from the USGS National Boat Ramps inventory