360 feet
Redwoods are remarkably fire-tolerant and long-lived; 500 years is an average life span, but some are more than 2,000 years old. Rising from massive trunks, they are the tallest trees in the world, some more than 300 feet tall. Redwood, particularly old growth redwood, is prized. Redwoods need great amounts of moisture - 65 inches of rain a year average and summer fog. Redwoods help create their own microclimate through the transpiration of moisture from the leaves to the atmosphere. A very large redwood can release up to 500 gallons of water a day into the air. Redwood is a rapidly growing tree, and some individual trees have been measured at more than 360 feet in height, making it the tallest measured tree species on the earth. In favorable situations, trees 20 years old may average 50 feet in height and 8 inches in diameter. Average mature trees are from 200 to 240 feet high with diameters of 10 to 15 feet at 4 feet 8 inches above the ground. Exceptional individuals sometimes reach a height of 350 feet, a diameter of over 20 feet, and an age of approximately 2000 years. Redwood leaves are green, flat, and sharp-pointed. Redwood, also known as Coast Redwood (Sequoia sempervirens), grows in a very narrow strip along the coast of California from the extreme southwestern corner of Oregon to 150 miles south of San Francisco in the Soda Springs drainage of Big Sur. The coast may receive 122 inches of rain per year. A large redwood tree--a 200 foot redwood with a trunk 5 feet in diameter--holds 34000 pounds of water and transpires up to 200-500 gallons of water each day. The oldest trees are not necessarily the tallest, as among grown trees there is no correlation between age and height When speaking of Redwood tree sizes, one should distinguish between the two types. The Coast Redwood trees (Sequoia sempervirens) are the tallest on Earth (the highest reaches up to 379 ft). The Giant Sequoia or Sierra Redwood trees (Sequoiadendron giganeum) reach 290 ft (average) and have the biggest volume. On the average, the bark is 12 inches thick. The land occupied by the Coast Redwoods is over 750 km. The tallest tree is Hyperion (in Redwood National Park) at 379.1 ft. Currently there are over 30 trees over 360 ft tall. There are over 150 trees over 350 ft tall. There are unconfirmed reports of a 380 ft tree that was chopped down in 1912 Sierra redwood trees are the largest trees in the world. Many sierra redwoods are between 250 and 300 feet tall, the tallest being about 325 feet high. While their height is impressive, the real wonder of a sierra redwood lies in its bulk. Many of these giants have diameters in excess of 30 feet near the ground, with a corresponding circumference of over 94 feet! The largest redwood in Calaveras Big Trees State Park is the Louis Agassiz tree. It is located in the South Grove. This tree is only 250 feet tall, but it is over 25 feet in diameter six feet above the ground! Giant sequoias are the world's largest single trees and largest living thing by volume. Giant sequoias grow to an average height of 50–85 m (164–279 ft) and 6–8 m (20–26 ft) in diameter. Record trees have been measured to be 94.8 m (311 ft) in height and over 17 m (56 ft) in diameter. The oldest known giant sequoia based on ring count is 3,500 years old. Giant Sequoias are among the oldest living things on Earth. The coast redwoods are the tallest trees on earth (to 350 feet) and the giant sequoias are the most massive (to 40 feet in trunk diameter). The giant sequoias have the potential to grow as tall as a coast redwood but always wind up losing their tops to a lightning strike in the severe weather of their native mountains.  Ancient Redwoods thrive along the Big Sur Coast. Redwood, also known as Coast Redwood (Sequoia sempervirens), grows in a very narrow strip along the coast of California from the extreme southwestern corner of Oregon to 150 miles south of San Francisco in the Soda Springs drainage of Big Sur. 1. Big Tree This old growth giant in Redwood National & State Parks has a circumference of 68 feet. This tree lives up to its name! On the Newton Drury Scenic Parkway near the Prairie Creek Visitor Center, the tree is an estimated 1,500 years old. 2.
http://www.mendorailhistory.org/1_redwoods/redwoods.htm http://www.bigsurcalifornia.org/redwoods.html http://www.shannontech.com/ParkVision/Redwood/Redwood2.html http://www.dimensionsinfo.com/how-big-is-a-redwood-tree/ http://www.parks.ca.gov/?page_id=1146 https://en.wikipedia.org/wiki/Sequoiadendron_giganteum https://www.giant-sequoia.com/faqs/giant-sequoia-questions/ http://www.bigsurcalifornia.org/redwoods.html http://redwoods.info/showrecord.asp?id=4583
how big is the average redwood tree