From NPS:
Tree Work on Northside Drive Starting on Monday, July 25th Valley District Forestry crew will be working along the Valley Loop roads felling and removing hazardous trees and encroaching vegetation. Traffic control will be in effect with minor delays between 7:00am and 3:30pm. Work areas will include North and South Side Drives. Estimated completion date 8/10.
Valley Loop Trail Resurfacing The Valley Loop Trail will be closed during work hours (8:00am-5:00pm) Mon through Friday, from Church Bowl to Lower Yosemite Falls loop. Detour signs are in place. This is due to trail resurfacing project. Expect closure to remain in effect through 8/22.
The cure for a fallacious argument is a better argument, not the suppression of ideas.
-- Carl Sagan