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Sandstone Flowage
Enhanced dataInteractive depth contours
Sandstone FlowageMarinette County, WI
Contours load with map Access
Interactive depth contours5-foot typical interval · Sonar-derived depth (C-MAP Genesis) · Gaps interpolated · Not for navigation
Source: C-MAP Genesis community sonar (derived)high confidence · QA passed · Select a contour to inspect its mapped depthDepths decoded from C-MAP Genesis Social Map community sonar recordings (used with permission), covering 69% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 39-ft maximum depth. More accurate than a pure model, but still an estimate. Not for navigation.LakeList assistant
Plan your lake day
Fishing spots, food, lodging, marinas, and rentals around Sandstone Flowage.
Start here
Fishing forecast
Best windows for Sandstone Flowage
Weather-based planning built from the National Weather Service hourly forecast near this lake.
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Checking wind, precipitation, and near-term weather windows.
Water temperature
Sandstone Flowage water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
74°FWarm
Seasonal estimate. Checking current National Weather Service air temperatures…
Comfortable summer pattern. Bass and panfish are active; early and late hours beat the midday heat.
Estimates are modeled, not measured. Actual temperatures vary with depth, wind mixing, and recent weather — verify conditions before swimming, boating, or heading onto ice.
DNR water check
Water quality quick take
Historical volunteer-monitoring record for this lake.
Last sampled Sep 2003
The last DNR samples for this lake are from 2003, when the water showed slight haze water (~9.5 ft Secchi), elevated algae (chlorophyll ~15 µg/L), and moderate nutrients (phosphorus ~24 µg/L). After 23 years without samples, these readings describe the lake as it was, not as it is.
Sandstone Flowage - Deep HoleStation 383279
Historical record only — no current water-quality data exists for this lake. LakeList verified 2026-07-12.Official Wisconsin information
Plan with DNR sources
LakeList links to the authoritative record so you can verify maps, rules, and current notices before leaving.
Historical DNR depth maps1 converted map sheetView DNR depth mapHistorical map · not for navigationFishing regulationsVerify current seasons, limits, and restrictionsOfficial DNR lake pageFacts, advisories, boating, and water qualityWater quality reportsMonitoring stations, clarity, and DNR reportsInvasive speciesVerified, observed, and historical AIS recordsBoating ordinancesLocal slow-no-wake and water-use restrictionsFish consumption advisoriesStatewide and waterbody-specific health guidance
Historical depth maps are not for navigation. Verify regulations and access at the official source before your trip.
Historical Wisconsin DNR maps
Sandstone Flowage depth maps
1 converted map sheet. These historical surveys are not for navigation.
Navigable depth map
Sandstone Flowage · sheet 1
Pan, zoom, and inspect the converted Wisconsin DNR historical map image in the browser. Historical survey — not for navigation.
Source: Wisconsin DNR · WBIC 531300 · image navigation only; spatial alignment pending · Historical lake maps are not for navigation.
Source: Wisconsin Department of Natural Resources. Converted for browser access with source URLs, checksums, and retrieval dates retained. Historical lake maps are not for navigation.
Wisconsin DNR fisheries survey
Fish population survey
Structured LakeList extraction from the 2015 DNR fisheries survey. Population estimates, density, and catch-rate indices use different units, methods, and scopes, so each value is presented in its original form rather than normalized against a different measure.
Survey indicatorsValues keep their source unit and method; unlike measures are not scaled or compared.
Management contextSandstone Flowage (WBIC 531300) only
Human-reviewed 2015 combined electrofishing catch and length metrics for Sandstone Flowage.
- Historical survey snapshot; not current regulations or navigation guidance.
- Only explicit fish-population observations and estimates were promoted; management targets, stocking rows, creel metrics, comparison-water values and unsupported chart-only values were excluded.
- Metric source pages, survey years, methods, units and exact report waterbody scope are retained.
Black Crappie
5 fish2015 catch count · p. 17.8 inches2015 mean length · p. 15.5 inches2015 min length · p. 111.2 inches2015 max length · p. 1
Bluegill
25 fish2015 catch count · p. 15.3 inches2015 mean length · p. 13 inches2015 min length · p. 17.1 inches2015 max length · p. 1
Largemouth Bass
4 fish2015 catch count · p. 115.4 inches2015 mean length · p. 113.1 inches2015 min length · p. 117.6 inches2015 max length · p. 1
Muskellunge
6 fish2015 catch count · p. 124.5 inches2015 mean length · p. 110.2 inches2015 min length · p. 143.3 inches2015 max length · p. 1
Northern Pike
17 fish2015 catch count · p. 118.4 inches2015 mean length · p. 112.2 inches2015 min length · p. 128.8 inches2015 max length · p. 1
Pumpkinseed
12 fish2015 catch count · p. 15 inches2015 mean length · p. 13.1 inches2015 min length · p. 17.4 inches2015 max length · p. 1
Rock Bass
31 fish2015 catch count · p. 16.2 inches2015 mean length · p. 13.5 inches2015 min length · p. 19.3 inches2015 max length · p. 1
Smallmouth Bass
69 fish2015 catch count · p. 114.5 inches2015 mean length · p. 15.1 inches2015 min length · p. 120.5 inches2015 max length · p. 1
Walleye
63 fish2015 catch count · p. 19.9 inches2015 mean length · p. 15.2 inches2015 min length · p. 123.2 inches2015 max length · p. 1
Yellow Perch
31 fish2015 catch count · p. 15.9 inches2015 mean length · p. 13.2 inches2015 min length · p. 110.3 inches2015 max length · p. 1
Sandstone Flowage fishery survey, 2015Matched by exact wbic name county · WBICs 531300 · verified 2026-07-20Wisconsin DNR fisheries report; LakeList operator documented permission to leverage this public report with source attribution.
Wisconsin DNR · 2026–2027 season
Lake-specific fishing regulations
Rule text published by the DNR for this waterbody, cached by WBIC and verified 2026-07-12.
All species
Catch and release fishing for largemouth and smallmouth bass is open year round unless otherwise noted. Motor Trolling is allowed with up to 3 hooks, baits, or lures, per angler.
Catfish
Season Dates: Open All Year. No minimum length limit and the daily bag limit is 10.
Cisco and whitefish
Season Dates: Open All Year. No minimum length limit and the daily bag limit is 10.
Lake sturgeon
Season Dates: Closed. No fishing allowed.
Largemouth and smallmouth bass
Season Dates: June 20, 2026 to March 7, 2027. The minimum length limit is 14" and the daily bag limit is 5.
Muskellunge and hybrids
Season Dates: May 2, 2026 to December 31, 2026 on open water. The minimum length limit is 40" and the daily bag limit is 1.
Northern pike
Season Dates: May 2, 2026 to March 7, 2027. No minimum length limit and the daily bag limit is 5.
Paddlefish
Season Dates: Closed. No fishing allowed.
Panfish
Season Dates: Open All Year. No minimum length limit and the daily bag limit is 25.
Rock, yellow, and white bass
Season Dates: Open All Year. No minimum length limit and the daily bag limit is unlimited.
Rough fish
Season Dates: Open All Year. No minimum length limit and the daily bag limit is unlimited.
Shovelnose sturgeon
Season Dates: Closed. No fishing allowed.
Trout and salmon
See Trout regulations layer.
Urban waters gamefish
This waterbody is not considered an urban water, Urban Waters Gamefish regulations do not apply.
Walleye, sauger, and hybrids
Season Dates: May 2, 2026 to March 7, 2027. The minimum length is 15", but walleye, sauger, and hybrids from 20" to 24" may not be kept, and only 1 fish over 24" is allowed. The daily bag limit is 3.
Regulations can change. The official DNR page controls; verify seasons, boundaries, bag limits, and emergency rules before fishing.
127surface acres
39max depth feet
1public access points
45.2271, -88.0843latitude, longitude
Access
Public access points
Boat launchSandstone Flowage Access45.22735, -88.07844Managed by TOWNSHIPTOWN OF STEPHENSONRamp surface: GravelADA-accessible feature: NoVerified 2026-07-12
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
Smallmouth BassWalleyeLargemouth BassNorthern PikePanfish
Depth FAQ
How deep is Sandstone Flowage?
Sandstone Flowage is 39 feet deep at its deepest point and averages about 10 feet, according to Wisconsin DNR records.
Is there a free depth map of Sandstone Flowage?
Yes. LakeList publishes a free interactive depth contour map of Sandstone Flowage at a typical 5-foot interval, with an optional 3D underwater view, derived from C-MAP Genesis community sonar (derived) survey data.
Where does the Sandstone Flowage depth map come from?
The interactive depth contours are derived from C-MAP Genesis community sonar (derived). Each contour set passes a visual QA review against the source document before it is published. The depths are derived from community sonar recordings (C-MAP Genesis Social Map, used with permission), with gaps between recordings interpolated; not for navigation.
Trust and freshness
Where this lake data comes from
Wisconsin DNR Lake Mapsname, coordinates, county, source identifiers
LakeList record updated 2026-07-14