Front:
20
BLUE HOLE ENTRANCE, CASTALIA, OHIO
BLUE HOLE
5A-H481
Back:
CASTALIA BLUE HOLE
Discovered by Robert Rogers, 1760, the most
extraordinary Spring in existence. Unknown
depth, visible depth 45 feet, and 75 feet in
diameter, source of water underground river.
Temperature 48 degrees winter and summer.
It never freezes and is not affected by floods
or drouth. Discharges 5,000 gallons of water
every minute. Fish can not live in Blue Hole,
as it is absolutely free from air or food. The
water is blue in color and extremely clear and
supplies water for a brook trout fishing club.
E. B. ACKLEY, SANDUSKY, OHIO
