The Lower Grande Ronde River in Washington is a popular destination for whitewater enthusiasts. The ideal streamflow range for the river is between 1,000 and 5,000 cfs. The river is rated as a Class II-III with some Class IV rapids depending on the water level. The segment mileage for the Lower Grande Ronde River is approximately 45 miles, stretching from Minam State Recreation Area to Heller Bar.

The river features several notable rapids and obstacles. Rapids such as the 'Boulder Garden,' 'Mudslide,' and 'Papa Bear' are known for their challenging drops and technical maneuvers. The 'Chinook Rapids' is one of the most significant rapids on the river, featuring a series of steep drops and boulder gardens.

Specific regulations apply to the area, including a permit system that limits the number of users per day. The number of commercial trips per day is limited to six, and private groups are limited to 25 people. Additionally, all users must abide by Leave No Trace principles, pack out all trash, and respect private property boundaries.

Overall, the Lower Grande Ronde River provides an exciting and challenging whitewater experience for intermediate paddlers. The river's unique rapids, beautiful scenery, and specific regulations make it a must-visit destination for any whitewater enthusiast.