The Spokane River Arm, part of Lake Roosevelt in Washington, offers paddlers a broad, lake-like section with opportunities for day trips and overnight excursions. This stretch begins below Little Falls Dam and extends to Lake Roosevelt proper. The waterway sees heavy motorized boat traffic, so paddlers should stay near the banks for safety and to avoid strong winds that can occur.

Access points include Porcupine Bay, where paddlers can put in and tour up or downstream. The next access point is Fort Spokane, located 9.4 miles downstream. Pit toilets are available at boat-in only camp areas along the route. The entire river right shoreline of this reach is part of the Spokane Tribe of Indians Reservation, adding cultural significance to the paddle.

For overnight trips, paddlers can utilize boat-in campgrounds and practice shoreline camping. A recommended 4-night trip covering roughly 50 miles runs from Porcupine Bay Campground/Boat Launch to Spring Canyon. Both starting and stopping points have parking lots and toilets.

Safety considerations include wearing a U.S. Coast Guard-approved life jacket at all times, which is required by Washington State regulations. Children 12 and under must wear life jackets when in vessels less than 19 feet long. Hypothermia is a significant risk due to cold, fast-moving water.

Paddlers should be aware that Lake Roosevelt is an active reservoir with changing water levels throughout the year. Lower water levels result in faster currents. A boat launch pass is required when using designated boat launches, but is not needed when launching from the shoreline.

Wildlife enthusiasts may spot various water-loving birds and other animals along the shoreline. The area's natural beauty offers a stark contrast to the nearby metropolitan area, providing a wilderness-like experience despite its proximity to populated regions.