See more detail here at the NPS site.

Time: Approximately 30 minutes. Delight in stunning views of Yosemite Falls in its entirety, with the opportunity to walk to the base of the lower fall; it roars in spring but falls silent by late summer.

Part of North America's tallest waterfall, Lower Yosemite Fall is the final 320-foot (98-meter) drop. Deafening in spring and early summer when the waterfall peaks in volume, you can expect to get sprayed with water when standing on the footbridge near its base. This short, easy walk rewards with spectacular views of both Upper and Lower Yosemite Falls. This paved loop trail offers different vantage points of Yosemite Falls and Yosemite Creek, and you can stop at the many exhibits to learn more about the natural and cultural history of the area.

Ride the free Valley Visitor Shuttle (7 am to 10 pm, year-round) to shuttle stop #6 and follow the bicycle path in either direction to access both the western and eastern sections of this loop trail. Beginning the hike from the west offers full views of Yosemite Falls right from the start. You can also walk along the bicycle path from the Yosemite Valley Visitor Center—this adds approximately 0.5 miles (0.8 km) to your hike).