Larson Reservoir

Larson Reservoir

Belltower, Carter County, MT
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Lake Information

Larson Reservoir, located in Carter County, Montana, spans an impressive 289.4 acres and sits at an elevation of 3,329.2 feet. This expansive body of water is one of the region’s premier destinations for fishing, wildlife observation, and outdoor recreation. Surrounded by rolling prairie and open grasslands, the reservoir offers breathtaking views of southeastern Montana’s rugged landscape, making it an ideal escape for nature lovers and outdoor enthusiasts. Fishing at Larson Reservoir is a highlight for visitors, as the waters are home to a thriving population of rainbow trout. Known for their vibrant colors and spirited fights, rainbow trout provide an exciting challenge for anglers of all skill levels. The reservoir’s size and depth create excellent fishing conditions, allowing for both shoreline casting and boat fishing opportunities. With the right technique, anglers can reel in impressive catches, making Larson Reservoir a prime location for sport fishing in Carter County. Beyond fishing, the reservoir is a haven for wildlife. Waterfowl, including ducks, geese, and pelicans, frequently make their way to the reservoir, creating a dynamic ecosystem along the water’s edge. Raptors such as hawks and eagles can often be seen soaring overhead, while deer and other mammals visit the shoreline to drink. The surrounding habitat, consisting of native grasses and scattered trees, enhances the area’s ecological diversity and provides shelter for a variety of species. Throughout the year, Larson Reservoir undergoes striking seasonal changes that add to its appeal. In the warmer months, the calm waters reflect Montana’s vast blue skies, while the surrounding vegetation thrives with lush greenery. Autumn introduces golden hues across the prairie, offering stunning scenery for photographers and nature enthusiasts. Winter transforms the reservoir with occasional ice cover, creating a peaceful, snow-dusted landscape that showcases Montana’s natural beauty in a whole new light. Larson Reservoir remains one of Carter County’s most cherished outdoor destinations, offering excellent fishing, abundant wildlife, and stunning scenery. Whether casting a line for rainbow trout, observing the diverse array of birds and mammals, or simply soaking in the tranquility of the remote Montana wilderness, visitors will find Larson Reservoir to be a true gem in the heart of the prairie.

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Current Conditions

44°F°
Feels like 32°F°
Cloudy
Today's High
65°F°
Today's Low
32°F°

Water Temperature

61°F
Updated:
Sign in to contribute temps.

Current water temperature for Larson Reservoir is 61°F.

Current Snapshot

Wind13 mph NW (Gust 20 mph)
Pressure
30.07 inHg
Visibility13 mi
Humidity75%
Cloud Cover90%

Forecast: Tuesday, Apr 29

Day 1 of 9

Hourly Insights

7 AM
35°F°
10 AM
50°F°
1 PM
61°F°
4 PM
65°F°

Temperature

High
65°F°
Low
32°F°

Precipitation

Chance0%
Amount0.00"
Typeclear

Wind

8mph
Avg Speed
Gusts up to
20mph
CalmModerateStrong
Max Speed14 mph

Sun, Moon & UV

Sunrise11:48 AM
Sunset2:03 AM
Moon PhasewaxingCrescent
Max UV Index7 (High)

Solunar Fishing Forecast

Action Rating
4/5

Todays action is rated a 4 (scale is 0 thru 5, 5 is the best)

Major Times (Best)

8:21 PM - 10:51 PM

6:00 AM - 6:00 AM

Minor Times (Good)

12:04 PM - 1:34 PM

6:00 AM - 6:00 AM

Outlook for Tuesday at Larson Reservoir

Expect temperatures ranging from 32°F to 65°F. Skies look mostly clear with little chance of precipitation. Winds will be averaging 8 mph, with potential gusts reaching up to 20 mph. The maximum UV index will be 7 (High), so plan sun protection accordingly. For anglers, today's fishing action is rated 4/5 (Todays action is rated a 4 (scale is 0 thru 5, 5 is the best)). Look for the best bite times during the major periods around 8:21 PM and 6:00 AM, or try the minor windows near 12:04 PM and 6:00 AM for potential early morning or evening action. Check back for the latest conditions and forecasts for Larson Reservoir.

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Lake Information

Elevation
N/A
Area
0 mi²
Coordinates
45.573, -104.497

Weather Forecast

Tuesday

65°F
32°F

Wednesday

55°F
43°F

Thursday

54°F
40°F

Friday

64°F
34°F

Saturday

73°F
43°F

Sunday

79°F
51°F

Monday

63°F
50°F

Tuesday

60°F
46°F

Wednesday

55°F
43°F
Tuesday - 4/29/2025
65°F
32°F
12am
36°F
61°F
30.13 hPa
6 mph
WSW
G: 10 mph
2am
34°F
61°F
30.12 hPa
4 mph
SSW
G: 8 mph
4am
33°F
61°F
30.10 hPa
5 mph
S
G: 10 mph
6am
33°F
61°F
30.07 hPa
5 mph
S
G: 12 mph
8am
40°F
61°F
30.02 hPa
10 mph
S
G: 19 mph
10am
50°F
61°F
29.98 hPa
13 mph
S
G: 19 mph
12pm
58°F
61°F
29.92 hPa
14 mph
SSW
G: 19 mph
2pm
63°F
61°F
29.87 hPa
13 mph
SW
G: 19 mph
4pm
65°F
61°F
29.79 hPa
12 mph
SW
G: 18 mph
6pm
64°F
61°F
29.77 hPa
9 mph
SW
G: 15 mph
8pm
57°F
61°F
29.74 hPa
4 mph
SSW
G: 7 mph
10pm
52°F
61°F
29.75 hPa
5 mph
S
G: 10 mph

Water Temperature History

Trends for Larson Reservoir

Current Temp

Sign in to view

Latest recorded surface temperature.

Lowest in Period

35°F

On Dec 15

Coldest point in the Last 12 Months.

Average in Period

61°F

Typical temp during the Last 12 Months.

Temperature Trend: Last 12 Months

Surface temperature over the selected period.

Key Observations (Last 12 Months)

  • Warmest avg: July (92°F).
  • Coolest avg: February (36°F).
  • Rapid warming often occurs: June → July (+18°F).
  • Sharpest cooling trend: October → November (-18°F).

Weather Forecast

Wind speed and pressure trends

Hourly Wind Forecast

Wind Direction

246°

Pressure

1020 mb

Cloud Cover

1%

Visibility

10 miles

Daily Pressure Forecast

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Frequently Asked Questions About Larson Reservoir

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