Fishing Forecast · Wisconsin · Updated August 2026

Heidmann Lake

Heidmann Lake earns a null for water quality. This forecast reads its measured clarity, depth, and trophic state — with each species' biology, the sun and moon, and today's conditions — to call when the fish move on Heidmann Lake and how to catch them.

34 ft
max depth: 2
fish species: 15 ft
water clarity: Natural lake
water body

Today · Thu Aug 20

★★★★★

The bite on Heidmann Lake today. Sunrise 5:59 AM, sunset 7:48 PM.

Moon: First Quarter · 50%
Major windows: 5:49 AM–7:49 AM

Best day · next 2 weeks

Thu Aug 27

★★★★★

Full Moon moon (100%). Fish the major windows at 11:09 PM and 11:31 AM.

Fishing Forecast for Heidmann Lake

A multi-factor outlook built from Heidmann Lake's measured water quality — clarity, trophic state, depth, and water-body type — combined with each species' biology, seasonal patterns, and today's live weather. It flags spawn timing, where the fish hold, and the techniques that fit this lake's water, not just the moon.

Largemouth Bass

Game FishSummerSummer pattern

Very Good

~74°F est.

Heidmann Lake runs 15 ft of clarity — so finesse presentations and natural colors on light line tend to out-fish reaction baits.

Because Heidmann Lake averages 15 ft of visibility (clear), so finesse presentations and natural colors on light line tend to out-fish reaction baits.
Its oligotrophic nutrient level puts the summer weedline near 15–20 ft — that edge is the high-percentage zone to hold largemouth bass through the warm months.
With a max depth of 34 ft, Heidmann Lake is deep enough to stratify in summer, so coldwater fish hold near the thermocline while warmwater fish stay above it.

Techniques for clear water

finesse: drop-shot, wacky/ned rignatural translucent colorslonger casts, fish low light

Season-by-season on Heidmann Lake

Season	Where	Structure	How
Spring	shallow 1–6 ft	protected bays, pads, laydowns, warming flats	soft plastics, jigs, lipless cranks pre-spawn
Summer	shallow-to-mid 3–15 ft	weed edges, docks, lily pads, deep weedlines	topwater at dawn/dusk, Texas-rigged plastics, frogs
Fall	shallow 2–10 ft	bays chasing baitfish, remaining green weeds	spinnerbaits, squarebill cranks, chatterbaits
Winter / Ice	deep 12–25 ft	main-lake basin edges (largely dormant in the north)	slow finesse — a marginal cold-water bite

Northern Pike

Game FishSummerSummer pattern

Fair

~74°F est.

Heidmann Lake runs 15 ft of clarity — so finesse presentations and natural colors on light line tend to out-fish reaction baits.

Because Heidmann Lake averages 15 ft of visibility (clear), so finesse presentations and natural colors on light line tend to out-fish reaction baits.
Its oligotrophic nutrient level puts the summer weedline near 15–20 ft — that edge is the high-percentage zone to hold northern pike through the warm months.
With a max depth of 34 ft, Heidmann Lake is deep enough to stratify in summer, so coldwater fish hold near the thermocline while warmwater fish stay above it.

Techniques for clear water

jerkbaits & bucktailsnatural perch/cisco colors

Season-by-season on Heidmann Lake

Season	Where	Structure	How
Spring	shallow 2–8 ft	weedy bays, marsh mouths, warming flats	spoons, spinnerbaits, big soft plastics
Summer	weed edges 6–18 ft; big pike deeper/cooler	cabbage/coontail edges, deep weedlines, cool water	large spoons, jerkbaits, dead-bait for big fish
Fall	variable 6–25 ft	deep weed edges, drop-offs, cisco/tullibee lakes	big swimbaits, sucker/dead-bait rigs — trophy season
Winter / Ice	6–20 ft	weed edges and flats	tip-ups with large shiners/suckers

The outlook is a transparent heuristic weighting of established angling factors, this lake's measured water quality, and live conditions — not a validated catch predictor. Water temperature is estimated from season and latitude unless a recent USGS gauge reading is available. Planning a meal? Check fish-consumption advisories for Heidmann Lake. Always follow current state regulations.

14-Day Fishing Calendar

Plan the next two weeks on Heidmann Lake. Anglers target Largemouth Bass, Northern Pike on Heidmann Lake.

Date	Rating	Moon	Sunrise	Sunset	Major Periods	Minor Periods
Thu, Aug 20	★½☆☆☆	First Quarter 50% lit	5:59 AM	7:48 PM	5:49 AM – 7:49 AM	10:16 PM – 11:16 PM 2:32 PM – 3:32 PM
Fri, Aug 21	☆☆☆☆☆	Waxing Gibbous 60% lit	6:01 AM	7:46 PM	6:14 PM – 8:14 PM 6:39 AM – 8:39 AM	10:52 PM – 11:52 PM 3:31 PM – 4:31 PM
Sat, Aug 22	☆☆☆☆☆	Waxing Gibbous 70% lit	6:02 AM	7:45 PM	7:05 PM – 9:05 PM 7:30 AM – 9:30 AM	11:37 PM – 12:37 AM 4:23 PM – 5:23 PM
Sun, Aug 23	☆☆☆☆☆	Waxing Gibbous 79% lit	6:03 AM	7:43 PM	7:55 PM – 9:55 PM 8:21 AM – 10:21 AM	12:30 AM – 1:30 AM 5:06 PM – 6:06 PM
Mon, Aug 24	☆☆☆☆☆	Waxing Gibbous 87% lit	6:04 AM	7:41 PM	8:46 PM – 10:46 PM 9:11 AM – 11:11 AM	1:31 AM – 2:31 AM 5:41 PM – 6:41 PM
Tue, Aug 25	★☆☆☆☆	Waxing Gibbous 93% lit	6:05 AM	7:40 PM	9:35 PM – 11:35 PM 9:59 AM – 11:59 AM	2:36 AM – 3:36 AM 6:10 PM – 7:10 PM
Wed, Aug 26	★½☆☆☆	Waxing Gibbous 98% lit	6:06 AM	7:38 PM	10:23 PM – 12:23 AM 10:46 AM – 12:46 PM	3:45 AM – 4:45 AM
Thu, Aug 27	★★☆☆☆	Full Moon 100% lit	6:08 AM	7:36 PM	11:09 PM – 1:09 AM 11:31 AM – 1:31 PM	6:34 PM – 7:34 PM 4:54 AM – 5:54 AM
Fri, Aug 28	★★☆☆☆	Full Moon 100% lit	6:09 AM	7:34 PM	11:54 PM – 1:54 AM 12:16 PM – 2:16 PM	6:55 PM – 7:55 PM 6:04 AM – 7:04 AM
Sat, Aug 29	★½☆☆☆	Waning Gibbous 97% lit	6:10 AM	7:33 PM	12:38 AM – 2:38 AM 1:00 PM – 3:00 PM	7:14 PM – 8:14 PM 7:14 AM – 8:14 AM
Sun, Aug 30	★☆☆☆☆	Waning Gibbous 93% lit	6:11 AM	7:31 PM	1:22 AM – 3:22 AM 1:45 PM – 3:45 PM	7:33 PM – 8:33 PM 8:25 AM – 9:25 AM
Mon, Aug 31	☆☆☆☆☆	Waning Gibbous 86% lit	6:12 AM	7:29 PM	2:08 AM – 4:08 AM 2:32 PM – 4:32 PM	7:52 PM – 8:52 PM 9:38 AM – 10:38 AM
Tue, Sep 1	☆☆☆☆☆	Waning Gibbous 78% lit	6:13 AM	7:27 PM	2:56 AM – 4:56 AM 3:22 PM – 5:22 PM	8:14 PM – 9:14 PM 10:54 AM – 11:54 AM
Wed, Sep 2	★☆☆☆☆	Waning Gibbous 69% lit	6:15 AM	7:26 PM	3:48 AM – 5:48 AM 4:16 PM – 6:16 PM	8:40 PM – 9:40 PM 12:12 PM – 1:12 PM

Server-rendered 14-day calendar starting 2026-08-20. Live in your browser shortly.

Methodology

How this forecast works

A plain solunar table only knows the moon. The LakeQuality Fishing Forecast starts there and adds what actually decides where and how fish bite on Heidmann Lake — factors we measure rather than guess:

Water clarity — Heidmann Lake's Secchi reading flips the playbook between clear-water finesse and stained-water reaction baits, and sets the low-light bite window.
Trophic state & depth — nutrient level and max depth set the summer weedline and whether the lake stratifies, which tells you how deep to fish.
Water-body type — natural lake vs. reservoir changes the structure that holds fish.
Species & season — each species' spawn-temperature window and seasonal movements, matched to the lake's estimated water temperature.
Sun & moon — the solunar major/minor periods and dawn/dusk twilight in the calendar below.

The species outlook is a transparent heuristic weighting of these established factors, and it now also factors in today's live conditions — wind, cloud cover, and the barometric (pressure) trend, recomputed for the current day. It's not a validated catch predictor, and water temperature is still an estimate from season and latitude unless a recent USGS gauge reading exists. It's the analysis a solunar table can't do, grounded in Heidmann Lake's real, measured water quality.

How to read the calendar

Major periods (≈2 hours) are centered on lunar transit (when the moon is highest in the sky) and lunar opposition (when the moon is directly underfoot). These are typically the strongest feeding windows.

Minor periods (≈1 hour) are centered on moonrise and moonset. They're secondary windows that often produce well — especially when they coincide with sunrise or sunset.

Day rating combines moon phase (peak near new and full moons, when lunar gravity is strongest) with the overlap of major periods and the dawn/dusk twilight. A 4–5 star day stacks all three.

At Heidmann Lake (lat 44.34°N), the longest day of the year is around June 21 with 15h 32m of daylight. The shortest is around December 21 with 8h 51m. Plan summer trips around the early-morning bite (around 5:30 AM) and the long evening window before sunset.

Frequently asked questions

What makes this better than a solunar fishing table for Heidmann Lake?

A solunar table only uses the moon. The LakeQuality Fishing Forecast adds Heidmann Lake's measured water quality — its clear water, trophic state, depth, and water-body type — matched to each species' spawn window and seasonal movements. That measured data drives where the fish hold and which techniques fit this lake's water, then the solunar calendar below adds the sun/moon timing. It's a transparent, multi-factor outlook, not a validated catch guarantee.

What is the best time to fish Heidmann Lake today?

Today's solunar calendar for Heidmann Lake (lat 44.34, lon -87.71) shows sunrise at 5:59 AM and sunset at 7:48 PM. The strongest fishing windows are around major solunar periods at 5:49 AM–7:49 AM, plus the 30-90 minutes around dawn and dusk.

What does the moon phase mean for fishing Heidmann Lake?

Solunar theory holds that fish activity peaks during major periods (when the moon is overhead or directly underfoot) and minor periods (moonrise and moonset). Fish feeding tends to intensify during the days surrounding the new moon and full moon, when lunar gravity is strongest. Today's moon at Heidmann Lake is First Quarter (50% illuminated).

When are the longest and shortest days at Heidmann Lake?

At Heidmann Lake's latitude (44.34°N), the longest day of the year is around June 21 with about 15h 32m of daylight. The shortest day is around December 21 with about 8h 51m of daylight. Sunrise and sunset shift by roughly 6 hours between solstices.

Are major or minor solunar periods more important?

Major periods (about 2 hours, centered on lunar transit and lunar opposition) are generally considered the strongest feeding windows. Minor periods (about 1 hour, centered on moonrise and moonset) are secondary but still productive — especially when they overlap with sunrise or sunset.

More for Heidmann Lake

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The species outlook is a transparent, multi-factor heuristic built from Heidmann Lake's measured water quality (clarity, trophic state, depth, water-body type) and established species biology, and it now also factors in today's live conditions — wind, cloud cover, and the barometric (pressure) trend, recomputed for the current day. It's not a validated catch predictor, and water temperature is still an estimate from season and latitude unless a recent USGS gauge reading is available. Solunar times use lat/lon and Meeus astronomical formulas, shown in Central Time. Always check local regulations and current conditions before fishing.

Source: EPA National Aquatic Resource Surveys, 2026.

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