Musselshell river montana

DIY Guide to Fly Fishing Musselshell River in Montana

The state of Montana is brimming over with fly fishing destinations that are worthwhile of a fishing vacation planned months in advance. The Musselshell River, on the other hand, is not regarded as one of the premier destinations.

The trout populations on this river are not as strong as many of the other rivers, and the Musselshell is known to dry up during the summer months in its middle section due to irrigation, leaving pools of water connected by small trickles.

That said the Musselshell River is a perfect complement to the fly fisherman who is traveling to Montana and tackling one of the more famed rivers that receives high fishing pressure.

A glimpse of the Musselshell River in Montana - Video by MontanaPictures

The Musselshell is primarily fished by locals as access is limited. Therefore, the angler who is in search of solitude will find it here. That is what makes this river the perfect complement to one of Montana’s heavily fished rivers.

The vacationing angler can experience one of Montana’s premier fly fishing experiences, and then experience the peace and quiet of a morning and evening on the Musselshell River.

Best Places to Fish the Musselshell River

The upper portions of the river, from Martinsdale to Harlowton, is the area where trout can be found. Brown trout average around 12 inches, with the occasional larger browns coming in at 5 pounds.

Plenty of whitefish are found on this upper section, as well as the occasional rainbow and brook trout. The water is too warm below Harlowton to support trout populations. It is along the warmer portions of this river that smallmouth bass and catfish can be found.

Musselshell River Map and Fishing Access Sites

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Martinsdale Reservoir FAS : 46.450611, -110.282127
Musselshell River FAS (Selkirk) : 46.464667, -110.223762
Musselshell River FAS (Harlowton) : 46.428991, -109.837585
Deadman's Basin Reservoir FAS: 46.328716, -109.432005
Musselshell River (Two Dot Access): 46.426898, -110.073561

Get the DIY Fly Fishing App to get turn-by-turn directions to access points shown on the map above and real-time stream flow conditions.

Access is going to be a challenge for any angler who decides to fish this river. Access points are few and far between.

Let’s focus on the 25 miles that contain the cooler water that trout thrive in from Martinsdale to Harlowton. Happily, there are access points within this 25 mile stretch, and since this river receives such little fishing pressure anglers will find plenty of solitude at each of them.

The Selkirk Fishing Access Site offers plenty of access and good tree coverage, yet anglers typically have to go a ways up or downstream to find a fishing spot due to the bushes along the bank.

The Two Dot Road Access Site and the Harlowton Fishing Access Site (Highway 191 Bridge) also offer good entrance to the Musselshell River.

Best Time to Fish the Musselshell River

Unlike many of the rivers in Montana, the Musselshell sees the best fishing opportunities limited to the months of April through June and some of the fall months.

Early mornings and late evenings are the prime times of day. Irrigation makes for low water levels during the months of July and August, as well as warmer water temperatures. These conditions can persist into September.

Musselshell River Hatches and Flies

The Musselshell River is not known for any particular hatches, so plan on having an arsenal of the usual trout tackle. Nymphs and streamers floated along down timber and banks that are undercut proves worthwhile. Additionally, the deep pools often hold larger trout.

Musselshell River Fishing Tips

The upper Musselshell River is ideal for wading due in large part to its relatively narrow width (at best 30 feet wide) and slower currents.

This is not, however, a river that can be waded without regard for spooking trout. Due to it’s calm current, small width from bank to bank, and lack of whitewater, trout are easily spooked by the ignorant fly fisherman.

The rule of thumb is slow down and be careful when wading. This upper 25 mile stretch is rarely floated, so anglers will find the river to themselves as they wade.

A 9-foot 5-wt fly rod with floating line is perfect for fishing dry flies and small nymphs on the Musselshell River. For larger nymphs and streamers a 9-foot 6-wt with a sink tip fly line makes life easier. A tapered 9-foot leader, with tippet size 3X to 6X to match the flies you are throwing, is pretty standard.

If you decide to travel to the warmer portions of the river and try your hands at the smallmouth bass, try a 6-weight rod with crayfish fly imitations.

Musselshell River Flow and Current Conditions

Musselshell River nr Martinsdale, MT

  • Flow: 1280 ft³/s
  • Water Level: 5.86 ft

Areal Flood Warning

10:14 AM MDT on June 18, 2018
10:15 AM MDT on June 21, 2018

Areal Flood Watch

3:09 PM MDT on June 19, 2018
12:00 PM MDT on June 20, 2018
Partly Cloudy
Tuesday 06/19 20%
Partly Cloudy
Clearing skies late. Lows overnight in the mid 40s.
Partly Cloudy
Wednesday 06/20 20%
Partly Cloudy
Intervals of clouds and sunshine. A stray shower or thunderstorm is possible. High 69F. Winds SSW at 5 to 10 mph.
Chance of a Thunderstorm
Thursday 06/21 80%
Chance of a Thunderstorm
Partly cloudy early with thunderstorms becoming likely during the afternoon. High 74F. Winds SW at 10 to 20 mph. Chance of rain 80%.
Chance of a Thunderstorm
Friday 06/22 40%
Chance of a Thunderstorm
Showers early then scattered thunderstorms developing later in the day. High 67F. Winds W at 15 to 25 mph. Chance of rain 40%.
Chance of a Thunderstorm
Saturday 06/23 60%
Chance of a Thunderstorm
Mostly sunny in the morning then increasing clouds with some scattered thunderstorms later in the day. High 66F. Winds WNW at 10 to 15 mph. Chance of rain 60%.

How to Get to Musselshell River

This is truly rugged Montana country. Using Martinsdale as the central point for travel purposes, the upper section of this river lies in between the major cities of Helena, Butte, Bozeman, and Billings.

If you will be flying in, I would suggest Billings Logan international Airport (which is a 2 hour drive to Martinsdale) as your flight destination. Airfare should be more affordable with this as your flight destination.

Lodging Near Musselshell River

Lodging may prove to be a challenge if you procrastinate on reservations. If your plans involve camping, the Martinsdale Reservoir offers primitive camping for tents and trailers.

The Crazy Mountain Inn in Martinsdale is highly reviewed, and other hotels and Inns are scattered about within a 30-40 mile radius.

This river is not known as a premier fishing destination in Montana, yet it should not be totally ignored by the anglers who love to have a river to themselves.

I suggest you put some consideration into extending your stay and trying this river out so as to experience the solitude of the Montana landscape.

Looking for more places to fish in Montana? Check out our DIY Guide to the Best Fly Fishing in Montana.

About the Author Ken Sperry

Ken is an avid fisherman of 40+ years who loves to explore and is on a quest to map the best places for fly fishing in America. He created DIY Fly Fishing and the DIY Fly Fishing App to share this information and help you find new places to fish. Have a question? You can get in touch with Ken here.