Delton Lake fishing

Fishing at Delton Lake is on a reservoir, stocked with Bluegill, Channel Catfish, Fathead Minnow, Walleye, Largemouth Bass, and Smallmouth Bass, and 1 more. It is stocked about 2.2 times a year since 2010, most often in January. Species guides list dawn, day, and dusk for Bluegill and Northern Pike, dusk and night for Channel Catfish, and dawn, dusk, and night for Walleye.

Last stocked

January 1, 2025

Plants on record

Since 2010

Species recorded

Average size

4.4 in

Surface acres

250.7

Access and facts

Water type: reservoir

Delton Lake is a 249-acre flowage in Sauk County with low water clarity. A public boat landing is listed, but landing-specific details weren't available from the DNR.

Sources: water_type , shore_notes , fishing_notes , watch_outs , watch_outs

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How Delton Lake is stocked

The first plant of the year usually falls in the first week of January. In 2025 it was January 1, 2025, about when it usually is.

No plants recorded in 2012, 2020, and 2022.

About 10,101 reported fish per acre, 4th most of 6 lakes in Sauk County with both a fish count and a surface area.

Fish at Delton Lake

Fishing Delton Lake is most likely to be for Walleye. Walleye accounts for 19 of 35 plants on record, ahead of Fathead Minnow and 5 more.

Walleye 19 plants

Plants: 19 of 35
Last stocked: January 1, 2025
Average length: 5.9 in

Seasons and rigs are on the Walleye guide.

Fathead Minnow 7 plants

Plants: 7 of 35
Last stocked: January 1, 2024
Average length: 2.1 in

Bluegill 5 plants

Plants: 5 of 35
Last stocked: January 1, 2015
Average length: 2.5 in

Seasons and rigs are on the Bluegill guide.

Channel Catfish 1 plant

Plants: 1 of 35
Last stocked: January 1, 2010
Average length: 8 in

Seasons and rigs are on the Channel Catfish guide.

Largemouth Bass 1 plant

Plants: 1 of 35
Last stocked: January 1, 2010
Average length: 3.3 in

Seasons and rigs are on the Largemouth Bass guide.

Northern Pike 1 plant

Plants: 1 of 35
Last stocked: January 1, 2013
Average length: 1 in

Seasons and rigs are on the Northern Pike guide.

Smallmouth Bass 1 plant

Plants: 1 of 35
Last stocked: January 1, 2010
Average length: 4.5 in

Seasons and rigs are on the Smallmouth Bass guide.

Fishing Delton Lake

Delton Lake offers fishing for a variety of species, including Panfish, Largemouth Bass, Northern Pike, Walleye, and Catfish. Largemouth Bass and Walleye are common in the lake, while Panfish, Northern Pike, and Catfish are also present for anglers to pursue.

Sources: apps.dnr.wi.gov

What to watch for

Anglers should be aware that Delton Lake has low water clarity. There is also an invasive species, Curly-Leaf Pondweed, present in the lake, which could impact fishing conditions.

Fish stocked per year

307,8262010
1,237,4072011
153,5542013
1,9582014
7,9822015
43,6652016
2,2112017
3622018
1,3582019
186,9802021
335,0402023
251,3002024
2,6702025

Stocking history

Showing 15 of 35 plants Showing 35 plants

Source: Wisconsin Department of Natural Resources.
Date	Species	Quantity	Avg. length	Source
January 1, 2025	Walleye	2,670	6.52 in	report
January 1, 2024	Walleye	1,300	6 in	report
January 1, 2024	Fathead Minnow	250,000	2 in	report
January 1, 2023	Fathead Minnow	333,500	2 in	report
January 1, 2023	Walleye	1,540	6.58 in	report
January 1, 2021	Fathead Minnow	185,000	2 in	report
January 1, 2021	Walleye	339	8 in	report
January 1, 2021	Walleye	1,641	7 in	report
January 1, 2019	Walleye	1,358	4.5 in	report
January 1, 2018	Walleye	362	5.2 in	report
January 1, 2017	Walleye	2,211	5.5 in	report
January 1, 2016	Walleye	1,165	5.8 in	report
January 1, 2016	Fathead Minnow	42,500	2 in	report
January 1, 2015	Bluegill	4,000	4 in	report
January 1, 2015	Walleye	3,982	5.89 in	report
January 1, 2014	Walleye	700	7 in	report
January 1, 2014	Walleye	1,258	6 in	report
January 1, 2013	Fathead Minnow	40,000	2 in	report
January 1, 2013	Bluegill	40,000	2 in	report
January 1, 2013	Walleye	3,554	5.9 in	report
January 1, 2013	Northern Pike	70,000	1 in	report
January 1, 2011	Fathead Minnow	1,199,980	2 in	report
January 1, 2011	Walleye	9,345	1.47 in	report
January 1, 2011	Walleye	1,382	7.36 in	report
January 1, 2011	Bluegill	26,700	1.5 in	report
January 1, 2010	Walleye	4,806	1.66 in	report
January 1, 2010	Walleye	1,013	5.6 in	report
January 1, 2010	Smallmouth Bass	1,667	4.5 in	report
January 1, 2010	Bluegill	2,000	2 in	report
January 1, 2010	Largemouth Bass	6,675	3.3 in	report
January 1, 2010	Walleye	1,670	8 in	report
January 1, 2010	Walleye	1,000	7.5 in	report
January 1, 2010	Fathead Minnow	265,000	2.5 in	report
January 1, 2010	Channel Catfish	1,000	8 in	report
January 1, 2010	Bluegill	22,995	3 in	report

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Species stocked here

Depth-by-season, top lures, and bait notes for each species stocked here are on its own species guide, linked above.