Trail 25 and Centennial Trail Loop

This loop offers a diverse mountain biking experience. You'll encounter varied terrain, including singletrack and doubletrack sections, moving through forests, meadows, hills, and bluffs. Expect to cross riverbeds and sandy areas. Specific features include mostly flat, sometimes rocky pedals adjacent to the Spokane River, and areas with thick brush locally known as "Little Vietnam." You'll also see impressive basalt rock formations, especially near Deep Creek Canyon. Some parts of Trail 25 feature short, steep, and loose pitches, though alternate routes might be available.

The full loop is approximately 26.75 km (16.6 miles) long and typically takes around 2 hours and 30 minutes to complete on a mountain bike. This duration can vary based on your pace and how often you stop to enjoy the scenery.

The trail offers continuous scenic views of the Spokane River and its surrounding natural environment. Notable highlights include the View of Spokane River Rapids, the View of Spokane River from Trail 25, and the Trail 25 — North Section. You'll also enjoy picturesque adventures through canyons, alongside basalt fields, and within lush forests and meadows. Keep an eye out for wildlife like ospreys, bald eagles, deer, and various bird species.

The best time to ride this loop is generally during the spring, summer, and fall months. During warm weather, be aware that sections with less shade can be particularly challenging. Always check current trail conditions before heading out.

Yes, dogs are generally allowed on this multi-use trail system. However, they must be kept on a leash at all times to ensure the safety and enjoyment of all trail users and wildlife. Always practice Leave No Trace principles and clean up after your pet.

As this loop is primarily within Riverside State Park and connects to the Centennial Trail, there are multiple access points and parking options. Look for trailheads within Riverside State Park, such as near Boulder Beach or Carlson Trailhead, which provide access to the Trail 25 system and its connections to the Centennial Trail.

Yes, since a significant portion of this loop is within Riverside State Park, a Discover Pass is required for vehicle access to state parks in Washington. This pass covers parking and helps support the maintenance of the park's facilities and trails. You can purchase a day pass or an annual pass.

The Trail 25 and Centennial Trail Loop is generally rated as having a moderate difficulty, making it suitable for mountain bikers with some experience. While Trail 25 (East) is considered easier, other sections, particularly Trail 25 (North) and areas near Boulder Beach, feature technical singletrack, steep inclines, and challenging uphill sections. Beginners might find certain parts difficult, but experienced riders will enjoy the varied challenge.

Yes, this loop is part of an extensive network. The Centennial Trail acts as a backbone, allowing you to connect with numerous other trails within Riverside State Park. The route itself incorporates sections of the Spokane River Centennial Trail, Washington State Route 291 Bike Route, Bowl and Pitcher Loop Trail, Interpretive Loop Trail, and various segments of Trail 25, among others.

This is a multi-use trail system shared by mountain bikers, hikers, and equestrians. Mountain bikers should always be prepared to yield to hikers and equestrian riders. Maintain a safe speed, announce your presence when approaching others, and be respectful of all users to ensure a pleasant experience for everyone.

Be prepared for varied conditions. Some sections, particularly in areas known as "Little Vietnam," can have thick brush and stinging nettle. You'll encounter short, steep, and loose pitches on Trail 25, and significant uphill sections, some described as "killer," especially before Carlson Trailhead. Trail 25 (North) includes a steep descent into a gorge and a challenging climb out. During hot weather, sections with less shade can be particularly demanding.