Montana Fly Fishing
Fly Fishing the Dearborn River

Fly Fishing the Dearborn River

Dearborn River
Photo Use Guidelines

The Dearborn River begins in the Scapegoat Wilderness, part of the Bob Marshall Wilderness Complex, and flows for more than sixty miles to the confluence with the Missouri River near Craig, MT. The Dearborn River initially flows through rugged, mountainous, terrain, before spilling out onto the plains of the Rocky Mountain Front.

The Dearborn River has two distinct sections, an upper and a lower. The upper stretch of the Dearborn River lies in mountainous, isolated country. After the Dearborn reaches the prairie, the river flattens out with only pockets of whitewater. In this lower section, which begins at the Highway 434 Bridge, river access is difficult as the river primarily flows through private property.

The upper section of the Dearborn River (the upper twenty miles) offers lots of action for small to moderate sized rainbow and cutthroat trout, averaging around ten-inches. Since the upper stretch of the Dearborn River is located in the wilderness, access is by foot or horse only. As this is a mountain stream, numerous pools, riffles and rapids are found all along this stretch. Fishing pressure is extremely low since the lack of road access keeps the vast majority of anglers away. A fairly heavily used hiking trail parallels the river, allowing for excellent access for anglers willing to venture off the roads.

Upper Dearborn River
Photo Use Guidelines

The lower section of the Dearborn River begins at the Highway 434 Bridge, and extends for forty miles downstream to the Missouri River. Only a handful of access sites exist along the Dearborn River in the lower section. As such, the Dearborn River is best floated. Since the lower section of the river can become very low by mid to late summer, floating is best done during late spring and early summer. During the early season, a stonefly hatch occurs on this section of river, offering excellent dry fly fishing using various stonefly imitations. Beginning in May and June, the Dearborn River offers decent dry fly fishing using standard caddis and mayfly imitations, such as the Elk Hair Caddis and Parachute Adams. Additionally, on the lower portion of this stretch, large streamers fished around the holes and undercut banks can pull out larger brown trout exceeding sixteen-inches.

Floating the Dearborn River between the Highway 434 Bridge and the Highway 200 Bridge can provide an interesting float, since several whitewater sections and one waterfall occur. This section of the Dearborn River is generally floated by experienced paddlers in high quality rafts and kayaks.

Due to the whitewater and the difficult raft access at the Highway 434 Bridge, better floating conditions on the river are found between the Highway 200 Access Bridge (Highway 200 crosses the river on and the Southern Rocky Mountain Front Scenic Byway) and Highway 287 Bridge. The stretch of the river can be floated by anyone, as there is no whitewater, although one small drop is found three miles below the Highway 434 Bridge may need to be portaged by inexperienced paddlers.

Below the Highway 434 Access Site lies the most popular floating stretch, lasting nineteen miles down to the confluence with the Missouri River. This should not be floated during late summer, as this stretch of river can be severely low, requiring long drags of a boat across the gravel bottom. The best fly fishing for brown trout is also found along this stretch, particularly where several feeder creeks flow into the Dearborn River.

Fishing pressure is very low on the lower stretch of the Dearborn River, due to difficult access and its close proximity to other well-known rivers. Fishing pressure will be heaviest around the few access sites. For the wade angler, a short hike up or downstream from the access sites will allow fishing in solitude and in waters that receive very low pressure.

Dearborn River : River Miles

Dearborn River Origin: 65
Highway 434 Bridge Access: 41
Dearborn Falls: 34
Highway 200 Bridge Access: 29
Highway 287 Bridge Access: 19
Confluence with Missouri River and Access Site: 0


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