It is situated five miles southwest of Sandusky in Castalia, a town that was laid out in 1836 and took its name from that of a Grecian fountain.

The hole is a spring, the size of a pond, that is fed by subterranean waters flowing upward from deep limestone orifices in the earth. It gushes forth 7,519 gallons of water per minute -- enough to supply the needs of a city of 75,000. It spawns Cold Creek, which then runs swiftly northward descending 57 feet into Sandusky Bay.

Originally the stream flowed into lowlands and a quagmire. It was channeled into a millrace when the first grist mill was built in the area in 1810.

There are several fishing clubs along the stream that keep it well stocked with rainbow and brown trout. The water is without oxygen and thus has to be aerated by waterwheels to sustain the fish.

One can see 50 to 60 feet down into the Blue Hole, but divers have never been able to locate the bottom. The water contains lime, soda, magnesia and iron, and has a blue color. It encrusts all vegetable matter, such as mosses and tree stumps that become immersed in it.

Floods and drought do not have any effect upon the Blue Hole. Temperature of the water is a constant 48 degrees year round, and this prevents the formation of ice in Lake Erie where the stream enters it.

Indians set up camps in the vicinity of the Blue Hole long before Major Robert Rogers found the site in 1761.

Blue Hole Watch Society from Ubu Projex

Robert Rogers biographical information

Major Robert Rogers - U.S. Army Ranger School - Ranger Hall of Fame

Ranger History - Major Robert Rogers

Castalia in mythology

Castalian Spring - Wikipedia