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Making America's Best Idea Even Better
Isle Royale National ParkAerial of the Rock Harbor Lighthouse and the Rock Harbor channel.
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Isle Royale National Park
Ranger III Statistics
Ranger III in dry dock
National Park Service
Ranger III in dry dock
 
Length 165'
Beam 34'
Depth 15' 1"
Draft 10' 6.5"
Load Displacement 835 short tons
Crew 6 to 9
Passenger Capacity 128
Cargo Capacities 100 tons dry
7,500 gallons of oil

750 cubic feet of
refrigerated and freezer
Main Engines 2 Caterpillar 3508 B;
850 BHP @ 1200 RPM
Propellers 2 Bird-Johnson Controllable
Pitch, 76" Diameter
Bow Thruster 250 HP/Hydraulic
36" diameter fixed pitch
Power Generators 2 Caterpillar 3304,
55KW each
Crane 3.1 Ton Hydraulic @
30-foot boom
Areal view of the Rock of Ages Lighthouse on a sunny day with few clouds.  

Did You Know?
Rock of Ages Lighthouse contained a second-order Fresnel lens which was the largest sized lens on the Great Lakes. View this magnificent lens at the Windigo Visitor Center.

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Last Updated: July 30, 2006 at 19:05 EST