Topock Marsh Lake
Mohave County, ArizonaView mapDirections
No nutrient or algae sampling on record from ADEQ for this lake.
- 43 ft max depth
- Public access
- Limited data
Topock Marsh Lake in Mohave County, Arizona has water-quality measurements published by ADEQ, shown here as reported.
Topock Marsh Lake is a lake in Mohave County, Arizona with an estimated average depth of about 43 feet. Limited fish-species data available. Public access is available with 3 public boat landings.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2026-03-26. Methodology: how these readings are compared.
What Topock Marsh Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch3 documented ramps
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Topock Marsh 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 Topock Marsh Lake
These are the measurements ADEQ publishes for Topock Marsh 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 Topock Marsh Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~43 ft est.
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 Topock Marsh Lake.
Lake Size & Watershed
Watershed (drainage) area
152 sq mi
HydroLAKES / HydroSHEDS
Surface area
2,197 acres
HydroLAKES / HydroSHEDS
Shoreline
25.5 mi
HydroLAKES / HydroSHEDS
Elevation
453 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.
Recreation & Access
- Fivemile LandingPublic
- Topcock Marsh - NorthPublic
- Jack Smith Park (Needles)Public
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Topock Marsh Lake
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Fishing Topock Marsh Lake
Nearby Lakes in Mohave County
Frequently asked questions about Topock Marsh Lake
Where is Topock Marsh Lake?
- Topock Marsh Lake is a lake in Mohave County, Arizona. Its water-quality measurements are published by ADEQ and shown on this page as reported.
What is the water quality of Topock Marsh Lake?
- Topock Marsh Lake in Mohave County, Arizona has water-quality measurements published by ADEQ, shown here as reported.
Is Topock Marsh Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Topock Marsh Lake?
- No published bathymetric survey covers Topock Marsh Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 43 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 Topock Marsh Lake?
- Topock Marsh Lake has 3 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Fivemile Landing, Topcock Marsh - North, Jack Smith Park (Needles). Public access is listed as yes.
Can I fish at Topock Marsh Lake?
- Topock Marsh Lake has 3 documented boat landings in the USGS National Boat Ramps inventory. 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.
Explore Topock Marsh Lake across LakeQuality
2 thermal springs within 17.9 mi, nearest Oatman Warm Springs
Species activity outlook by water temperature and season
Where to stay at Arizona's top lakes, each with its readings
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Where this data comes from
3 measurements from 1 monitoring station, 2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Great Lakes Environmental Center
GLEC3 samples · 2026
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 300.0 ~ EPA; Determination of Inorganic Anions by Ion Chromatography
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory