Palouse to Cascades State Park Trail

The Palouse to Cascades State Park Trail, formerly known as the John Wayne Pioneer Trail and the Iron Horse Trail, is a rail trail that spans most of the U.S. state of Washington. It follows the former railway roadbed of the Chicago, Milwaukee, St. Paul & Pacific Railroad (Milwaukee Road) for 300 mi across two-thirds of the state, from the western slopes of the Cascade Mountains to the Idaho border.

The former Milwaukee Road roadbed was acquired by the state of Washington via a quitclaim deed, and is used as a non-motorized recreational trail managed by the Washington State Parks and Recreation Commission and by the Washington State Department of Natural Resources. State legislation "railbanked" the corridor with provisions that allow for the reversion to railroad usage in the future.

History
The trail was originally a railroad line which was decommissioned in 1980. Afterwards, establishing a public right-of-way trail on the land was championed by various people and organizations, especially by Chic Hollenbeck, who founded the John Wayne Pioneer Wagons and Riders Association in the 1980s. Beginning in 1981, Hollenbeck and his organization organized annual horse and wagon rides across Washington along the trail. The organization aimed to fortify the public ownership of the land, in opposition to nearby private property owners’ extralegal efforts to exert control over the land for their own use. When it was officially established, the eastern part of the trail took on the name "John Wayne Trail" after the organization that lobbied for its existence, themselves being named after actor John Wayne, while the western 100 mi portion from Cedar Falls (near North Bend) to the Columbia River south of Vantage was named the "Iron Horse Trail" and had been developed and managed as the Iron Horse State Park.

In 2002, it was designated a National Recreation Trail.

In 2015, two Washington state representatives from the 9th district attempted to include language in an amendment to the state's 2015 capital budget that would close a 130 mi section of the trail east of the Columbia River. It was later revealed that a typo, referring to the closed section as "from the Columbia River to the Columbia River", nullified the amendment temporarily.

In April 2018, Washington State Parks proposed renaming the trail and Iron Horse State Park to resolve confusion. Additionally, the name did not conform to the State Parks naming policies. The Washington State Parks and Recreation Commission adopted a new name, the Palouse to Cascades State Park Trail, in May of that year.

In April 2022, the Beverly Railroad Bridge across the Columbia River reopened to provide access for hikers, cyclists, and horse riders following the trail. The railroad trestle, south of Vantage, was renovated at a cost of $5.5 million by the state government. Other sections of the trail in Eastern Washington remain unfinished or in need of replacement.

Iron Horse Park access
Access points to the developed portion of the trail, managed by Washington State Parks and Recreation Commission, are at:
 * Rattlesnake Lake, Cedar Falls – western terminus and connection to the Snoqualmie Valley Regional Trail
 * Twin Falls
 * Hyak – provides access to the 2.3 mi Snoqualmie Tunnel through the crest of the Cascade Mountains. In winter this site provides a public sledding area and ski trails groomed for track and skate style cross country skiing from Hyak eastward.  Washington DOT Sno-pass parking is required at this site in winter.  Within walking/snowing/skiing distance is a state parks owned lodge.
 * Easton – descending the eastern slope of the Cascades
 * Cle Elum – provides access to the Upper Yakima River Canyon
 * Thorp – near the historic Thorp Mill
 * Kittitas, Washington – in the open farm valley of the Yakima River drainage east of Ellensburg, Washington
 * Army West – at the western edge of the stretch passing through the shrub-steppe country of the U.S. Army's Yakima Training Center
 * Army East – at the eastern edge of the stretch passing through the Yakima Training Center as it reaches the Columbia River

Tunnels
The trail features six tunnels, including the longest trail tunnel in the world, the 11,894 ft Snoqualmie Tunnel, which was #50 on the railroad's numbering system. The other five tunnels in order are the Boylston (#45), Thorp (#46), Picnic Area (#47), Easton (#48) and Whittier (#49). The Boylston Tunnel was also known as the Johnson Creek tunnel to the railroad and sometimes tunnels #46 and #47 are known as the Thorp Tunnels.

Undeveloped
Access points to the undeveloped portion of the trail, managed by Washington State Department of Natural Resources, have not been formally opened to the public. However, the trail provides access to the unique geological erosion features of the Channeled Scablands regions of the state of Washington, and several stretches have been recognized as providing access to this area created by the cataclysmic Missoula Floods that swept periodically across eastern Washington and down the Columbia River Plateau during the Pleistocene epoch. At Malden, once home to the largest railroad turntable in the world, Washington State Parks is planning a trailhead in the former rail yard.

Iron Horse State Park
Iron Horse State Park, part of the Washington State Park System and the Palouse to Cascades State Park Trail, is a 1612 acre state park located in the Cascade Mountains and Yakima River Valley, between Cedar Falls on the west and the Columbia River on the east.

The park is contiguous with a rail trail that crosses Snoqualmie Pass. The trail is located within the former right-of-way of The Milwaukee Road, officially the Chicago, Milwaukee, St. Paul and Pacific Railroad. Most of the right-of-way between Cedar Falls and the Idaho border was acquired by the state, through a quitclaim deed, as a result of the railroad's 1977 bankruptcy. As part of the reorganization of the company, the railroad embargoed its lines west of Miles City, Montana, in 1980 and ceased service in Washington. The state acquired the land in the early 1980s and eventually converted the right-of-way west of the Columbia River into a 110 mi hiking, mountain biking, and horseback riding trail. The trail continues beyond Iron Horse State Park to the Idaho border. Iron Horse State Park contains the most developed portion of the trail.

At Cedar Falls, the west end of Iron Horse State Park, the Palouse to Cascades State Park Trail connects to the Snoqualmie Valley Trail of the King County Regional Trail System. The Snoqualmie Valley Trail is built on a portion of the former Milwaukee Road branch line from Cedar Falls to Everett.

Recreation
Like most rails-to-trails projects, Iron Horse is popular with hikers and cyclists. There are many trail heads across the state, most with modern facilities, ample parking for a less common trail, and even a handful of campgrounds.

The trail passes through mostly woodland, along lakes and waterfalls, and goes directly through the divide at the old Snoqualmie Tunnel. The park is easily accessible from I-90.

Iron Horse is popular for its scenery and its history, although it is less well-known than other nearby areas like the Alpine Lakes Wilderness or Snoqualmie Falls.

The park trail continues through the Town of South Cle Elum where the preserved Milwaukee Road depot and substation, as well as the remains of the rail yard are located. The depot, substation, and rail yard are listed in the National Register of Historic Places. There is a small museum in the depot. In Kittitas, the trail passes The Milwaukee Road depot and the ruins of one of the substations. That depot is also listed in the National Register of Historic Places. In addition to these buildings, other infrastructure remains, such as tunnels and bridges.