The Bible Run River Run on the Boulder River in Montana features Class II-III rapids, making it a moderately challenging run for intermediate paddlers. The section is approximately 8 miles long and features obstacles such as boulder gardens and narrow chutes. The best time to float this section is in late spring or early summer when water levels are higher, with recommended flows between 1,000 and 2,500 cfs. Overall, the Bible Run River Run is a fun and exciting run for experienced paddlers looking for a moderate challenge.