mount diablo state park, 45 miles east of san francisco. so far this fire has scorched 3200-acres and 45% contained. it is fueled by plenty of tinder dry brush. the last big fire in this area was back in 197. no structures have been lost but 75 now we re told are in the danger zone. there are more than 700 firefighters on the scene with nine helicopters providing air support, something they need in this area. mount die ablow is encredittably steep, very rugged terrain. access is very difficult. reporter: meanwhile another blaze flared up near happy valley, california, just south of reading of the of the clover fardaged or destroyed some 30 structures and threatened 350 others as well as water towers and power lines. homeowners say flames jumped acrossroads, forcing them to quickly grab their belongings and get out. fire crews are expecting temperatures in the high 90s today and low humidity, jenna.