Lower Horse Canyon is a popular whitewater river run located in the state of Utah. The ideal flow range for this stretch of the river is between 200-600 cfs, with 400 cfs being the optimal level. The class rating for this section is Class III-IV, with steep and technical rapids that require advanced skills and experience. The segment mileage is approximately 6 miles long, starting at the Horse Thief Reservoir and ending at the confluence of the Green River.

Some of the notable rapids and obstacles on this stretch of the river include the Meat Grinder, a steep and narrow chute that requires precise navigation, and the S-Turn, a series of tight turns that demand quick reflexes and solid paddling. Other rapids like the Hail Mary and the Adrenaline Falls add to the excitement and challenge of the run.

To ensure the safety of all participants, there are specific regulations that apply to the Lower Horse Canyon area. All boaters are required to wear a US Coast Guard approved personal flotation device, and motorized vehicles are not allowed in the river corridor. Additionally, camping and fires are prohibited along the riverbank, and all waste must be packed out.

Overall, Lower Horse Canyon is a thrilling and challenging whitewater river run that offers breathtaking scenery and numerous rapids and obstacles. However, it is important to be prepared and experienced before embarking on this adventure, as the rapids can be unforgiving and dangerous without proper training and equipment.