The Green River Pass to Lower Green River Lake segment of the Whitewater River in Wyoming is a popular spot for kayaking and rafting enthusiasts. The ideal streamflow range for this section of the river is between 500 and 2,500 cfs. The class rating of this segment ranges from Class II to Class III, with some rapids that are more challenging, such as the "Half Moon Rapid" and the "Blind Rapid."

The total segment mileage of this section of the river is approximately 7.5 miles, and it takes about 2-3 hours to complete the run. Some of the specific river rapids and obstacles that kayakers and rafters may encounter include large boulders, waves, and strong currents.

In terms of regulations, anyone wanting to kayak or raft on the Whitewater River must obtain a permit from the Bridger-Teton National Forest. The permit is valid for one day and can be obtained at the Green River Lakes Campground. Additionally, anyone using the river must follow Leave No Trace principles and respect the natural environment.

Overall, the Green River Pass to Lower Green River Lake segment of the Whitewater River in Wyoming offers a thrilling experience for kayakers and rafters. With its challenging rapids and stunning scenery, it is a must-visit destination for anyone looking to experience the adrenaline rush of whitewater rafting.