Topock Marsh Lake
Mohave County, ArizonaView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- 43 ft max depth
- Public access
- Limited data
Topock Marsh Lake in Mohave County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar.
- Max depth
- ~43 ft est.
- Public access
- Yes
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Why Topock Marsh Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Topock Marsh Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by ADEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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. Grade methodology: LakeQuality methodology.
What Topock Marsh Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch3 documented ramps
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Topock Marsh Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~43 ft est. |
| Average Depth | ~11 ft est. |
| Public Access | Yes |
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
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
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. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Topock Marsh Lake?
- Topock Marsh Lake in Mohave County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Topock Marsh Lake safe to swim in?
- The letter is 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.
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
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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)
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