Unfortunately, it looks like the stamp has come up missing again. You can find the picture of the stamp in the gallery to put in your passport
This cache is part of the ten-county Allegheny GeoTrail project. It contains a special stamp to be used in your GeoTrail passport, which you'll want to obtain before setting out to find the cache. Please do not remove the stamp! Get your passport stamped at 6 or more AGT caches within a county, and get a FREE geocoin representing that county. There are ten different coins to collect, plus a bonus 11th coin if you get all 10 counties. Click the logo for more information!

When built in 1882, the Kinzua Viaduct was the highest railroad bridge in the world. It was constructed as an alternative to laying an additional eight miles of track over rough terrain along the line leading to McKean County’s coal, timber and oil lands. Built of iron, the original viaduct was 301 feet high, 2,053 feet long, and weighed 3,105,000 pounds. By 1900, it became necessary to rebuild the entire structure with steel to accommodate heavier trains. That May, about 100 to 150 men working ten-hour days completed the job in 105 days. The new steel viaduct had the same measurements, but now weighed 6,715,000 pounds. Freight traffic discontinued in June of 1959. In 1963, Governor William Scranton signed a law that created Kinzua Bridge State Park. The park officially opened in 1970. In 1977, Kinzua Viaduct received national recognition when it was placed on the National Register of Historic Civil Engineering Landmarks.
On Monday, July 21, 2003, at approximately 3:15 p.m., an F1 tornado (wind speed 73 – 112 mph) struck the side of Kinzua Viaduct. Eleven towers from the center of the bridge were torn from their concrete bases and thrown to the valley floor. Fortunately no one was seriously injured.
Don't miss the new Visitors Center and bridge overlook, it gives great views of the viaduct and the Kinzua Creek Valley. The picnic area has shaded picnic tables, water and a modern restroom. Easy access to cache, please use stealth during park activities. FTF gets PaRacers Silver Bullet. Cache is well stocked, please trade fairly. PLEASE REHIDE CACHE OUT OF SIGHT SO IT DOESN'T GET MUGGLED AGAIN!