At Mount Diablo, Hetherington Loop is gorgeous this time of year. We should see Big Berry Manzanita in flower, and Toyon in fruit. If we are lucky, we might get to see crystal clear Donner Creek during a high flow.
We Will take Donner Canyon Rd, and Hetherington loop trail. Round trip distance is 3 miles, elevation gain is 350 ft.
If there has been a lot of rain, wear appropriate footwear, since it can get very muddy on this walk. Bring lunch and water.
Meet at end of Regency Drive in Clayton.
Take 24 or 680 to Ygnacio Valley Road. Continue on Ygnacio valley Road into City of Clayton, turn right on Clayton Road. Take Clayton Road past the first intersection with Marsh Creek Road. In about a mile, it becomes Marsh Creek Road.
Continue straight on Marsh Creek Road. Turn right on Regency Drive. Go to end of Regency. Do not turn onto Rialto drive, that is for a different trail.