The Lower Bottom Four River Run in Colorado is a Class III to IV section of water that offers exciting rapids and stunning scenery. The best time to float this section is during the late spring and early summer months when the water levels are high enough to navigate the rapids. At lower water levels, this section can become technical and more challenging. Obstacles such as rocks, steep drops, and narrow chutes can make this run difficult for beginners. Recommended flow levels for this section are between 800 and 1500 cfs. Experienced rafters will love the exhilarating rapids, while beginners can take on this run with a knowledgeable guide.