Hansen Reservoir fishing

Hansen Reservoir fishing is stocked with Rainbow Trout, Cutthroat Trout, and Tiger Trout on a reservoir. It is stocked about 1.8 times a year since 2011, most often in May and June. Species guides list dawn and dusk as the active times.

AI-generated illustration, not a photo of this lake
Last stocked
June 18, 2026
· Cutthroat Trout
Plants on record
29
Since 2011
Species recorded
3
Average size
4.9 in
Elevation
4,243.5 ft

Fish at Hansen Reservoir

3 stocked · 0 confirmed present

Around the dates Hansen Reservoir is stocked, Open-Meteo's 2016-2025 archive puts mean air temperature at 50.6°F in May, 60.2°F in June, 39.6°F in April, 44.1°F in October. That is air temperature at these coordinates, not water temperature. Open-Meteo

Rainbow Trout Stocked · 19 plants · last May 18, 2021 Best: dawn, dusk

Last stocked May 18, 2021 · avg 4.8 in · 19 plants

Best: dawn, dusk

Rainbow Trout species guide
Tiger Trout Stocked · 2 plants · last October 15, 2025 Best: dawn, dusk

Last stocked October 15, 2025 · avg 5.4 in · 2 plants

Best: dawn, dusk

Tiger Trout species guide

The lake also received plantings of cutthroat trout, which continue to do well. (lewistownnews.com, accessed October 5, 2026)

Drafted by AI from the cited sources and checked before publishing.

How Hansen Reservoir is stocked

Source: Montana Fish, Wildlife & Parks.

Fish stocked in 2011

6,200

Fish stocked in 2012

6,000

Fish stocked in 2013

6,001

Fish stocked in 2014

5,998

Fish stocked in 2015

6,103

Fish stocked in 2016

7,013

Fish stocked in 2017

7,006

Fish stocked in 2018

6,999

Fish stocked in 2019

3,504

Fish stocked in 2020

3,545

Fish stocked in 2021

3,499

Fish stocked in 2022

3,500

Fish stocked in 2023

3,575

Fish stocked in 2024

3,000

Fish stocked in 2025

4,040

Fish stocked in 2026

950

Stocking history

Source: Montana Fish, Wildlife & Parks.
Date Species Quantity Avg. length Source
June 18, 2026Cutthroat Trout9505.32 inreport
October 15, 2025Tiger Trout5006.85 inreport
June 19, 2025Tiger Trout5004.03 inreport
June 17, 2025Cutthroat Trout3,0404.22 inreport
June 27, 2024Cutthroat Trout3,0003.85 inreport
May 11, 2023Cutthroat Trout3,5754.45 inreport
June 29, 2022Cutthroat Trout3,5005.14 inreport
June 24, 2021Cutthroat Trout1,0005.2 inreport
May 18, 2021Rainbow Trout1,4994.62 inreport
May 13, 2021Rainbow Trout1,0002.98 inreport
June 30, 2020Cutthroat Trout1,0005.32 inreport
May 27, 2020Rainbow Trout1,0003.04 inreport
May 6, 2020Rainbow Trout1,5453.73 inreport
June 12, 2019Cutthroat Trout1,0005.02 inreport
May 20, 2019Rainbow Trout1,5044.32 inreport
May 16, 2019Rainbow Trout1,0003.06 inreport
May 21, 2018Rainbow Trout5,9994.31 inreport
May 21, 2018Rainbow Trout1,0002.89 inreport
May 26, 2017Rainbow Trout9993.47 inreport
May 16, 2017Rainbow Trout6,0074.12 inreport
June 10, 2016Rainbow Trout1,0033.51 inreport
April 29, 2016Rainbow Trout6,0104.67 inreport
October 9, 2015Rainbow Trout967.5 inreport
May 1, 2015Rainbow Trout6,0074.96 inreport
May 29, 2014Rainbow Trout5,9984.12 inreport
May 22, 2013Rainbow Trout6,0014.05 inreport
April 10, 2012Rainbow Trout6,0003.24 inreport
June 6, 2011Rainbow Trout2718.42 inreport
June 6, 2011Rainbow Trout6,1734.43 inreport

Access and facts

Water type
reservoir
Nearest town
Lewistown

A small reservoir about 7 miles southeast of Lewistown, near the Big Springs Trout Hatchery.

Drafted by AI from the cited sources and checked before publishing.

View larger map · Open in Google Maps · Directions

Advisories, closures, regulations and water conditions change. Check the Montana Fish, Wildlife & Parks before you go.

Nearest lakes

Big Casino Creek Reservoir 5.2 mi last stocked August 7, 2025 Upper Frog Pond 6.1 mi last stocked June 5, 2026 Carters Pond 10.9 mi last stocked May 21, 2026 Upper Carters Pond 11.5 mi last stocked June 3, 2026 Brewington Pond South 26.7 mi last stocked May 27, 2026

Common questions

What fish are at Hansen Reservoir?

Fishing Hansen Reservoir usually means Rainbow Trout: Rainbow Trout accounts for 19 of 29 plants on record, ahead of Cutthroat Trout and one more. Rainbow Trout was last stocked May 18, 2021, averaging 4.8 in. Cutthroat Trout was last stocked June 18, 2026, averaging 4.8 in. Tiger Trout was last stocked October 15, 2025, averaging 5.4 in.

When is Hansen Reservoir stocked?

Last stocked June 18, 2026. It is stocked about 1.8 times a year since 2011, most often in May and June.

How big are the fish stocked at Hansen Reservoir?

Stocked fish average 4.9 in. Rainbow Trout average 4.8 in. Cutthroat Trout average 4.8 in. Tiger Trout average 5.4 in.

How do you get on Hansen Reservoir?

The nearest town is Lewistown. A small reservoir about 7 miles southeast of Lewistown, near the Big Springs Trout Hatchery.

Sources (2) +