Muddy Fork is a tributary, about 6 miles (10 km) long, of the Sandy River

Sandy River (Oregon)

The Sandy River is a tributary of the Columbia River in northwestern Oregon in the United States. Measured by a United States Geological Survey gauge downstream of the Sandy's confluence with the Bull Run River, from the mouth, the river's average discharge is . The maximum daily recorded flow...

 in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of Oregon

Oregon

Oregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...

. Arising at the base of Sandy Glacier

Sandy Glacier

Sandy Glacier is an alpine glacier located on the west slope of Mount Hood in the U.S. state of Oregon. It extends in elevation from about . The glacier is the source of Muddy Fork, a tributary of the Sandy River. The upper extent of the glacier is known for extensive crevasses.The glacier is a...

 on the west slope of Mount Hood

Mount Hood

Mount Hood, called Wy'east by the Multnomah tribe, is a stratovolcano in the Cascade Volcanic Arc of northern Oregon. It was formed by a subduction zone and rests in the Pacific Northwest region of the United States...

, it flows west through the Mount Hood Wilderness

Mount Hood Wilderness

The Mount Hood Wilderness is a protected wilderness area inside the Mount Hood National Forest which is located in the U.S. state of Oregon. The area, covering , includes the peak of Mount Hood and its upper slopes, and ranges from temperate rain forests at the lower elevations, to glaciers and...

 in the Mount Hood National Forest

Mount Hood National Forest

The Mount Hood National Forest is located east of the city of Portland, Oregon, and the northern Willamette River valley. The Forest extends south from the Columbia River Gorge across more than of forested mountains, lakes and streams to the Olallie Scenic Area, a high lake basin under the slopes...

. It joins the Sandy River in Old Maid Flat, about 5 miles (8 km) northeast of Rhododendron

Rhododendron, Oregon

Rhododendron is an unincorporated community in Clackamas County, Oregon, United States. It is located within the Mount Hood Corridor, between Government Camp and Zigzag on U.S. Route 26...

. The stream offers limited fishing for cutthroat trout

Cutthroat trout

The cutthroat trout is a species of freshwater fish in the salmon family of order Salmoniformes. It is one of the many fish species colloquially known as trout...

.

Course

Muddy Fork begins at 5890 feet (1,795.3 m) above sea level at the foot of Sandy Glacier in the Mount Hood Wilderness of the Cascade Range

Cascade Range

The Cascade Range is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as the North Cascades, and the notable volcanoes known as the High Cascades...

. Its entire course lies within the Mount Hood National Forest and Clackamas County

Clackamas County, Oregon

Clackamas County is a county located in the U.S. state of Oregon. The county was named after the Native Americans living in the area, the Clackamas Indians, who were part of the Chinookan people. As of 2010, the population was 375,992...

. Falling 3252 feet (991.2 m) between source and mouth, the stream's average loss of elevation is about 500 ft/mi.

Flowing generally west from the glacier, it passes south of McNeil Point, which is on the stream's right. It then flows between Yocum Ridge, which is to the left, and Bald Mountain to the right before being crossed by the Pacific Crest Trail

Pacific Crest Trail

The Pacific Crest Trail is a long-distance mountain hiking and equestrian trail on the Western Seaboard of the United States. The southern terminus is at the California border with Mexico...

 near the eastern end of Old Maid Flat. The Sandy River enters Old Maid Flat to the left of Muddy Fork, and the two run roughly parallel across the flat until joining near Last Chance Mountain, which is on the right. The confluence is upstream of Fred McNeil Campground and Lolo Pass Road (Forest Road 18). Muddy Fork has no named tributaries.

Fishing

Although Muddy Fork is closed to salmon

Salmon

Salmon is the common name for several species of fish in the family Salmonidae. Several other fish in the same family are called trout; the difference is often said to be that salmon migrate and trout are resident, but this distinction does not strictly hold true...

 fishing, the stream has wild cutthroat trout "of fair size". The stream is open to catch and release

Catch and release

Catch and release is a practice within recreational fishing intended as a technique of conservation. After capture, the fish are unhooked and returned to the water before experiencing serious exhaustion or injury...

 fishing for cutthroat but only with artificial flies

Artificial fly

An artificial fly or fly lure is a type of fishing lure, usually used in the sport of fly fishing . In general, artificial flies are the bait which fly fishers present to their target species of fish while fly fishing...

 and lure

Fishing lure

A fishing lure is an object attached to the end of a fishing line which is designed to resemble and move like the prey of a fish. The purpose of the lure is to use movement, vibration, and colour to catch the fish's attention so it bites the hook...

s. Conditions are generally best in spring before seasonal runoffs of glacial silt.