Dive-site story
Gilboa Quarry is a key inland diving hub in the American Midwest, catering to open-water students and trimix technical divers alike. This former limestone quarry descends from shallow training shelves fitted with submerged platforms into a deep basin. Sunken features include a Grumman Gulfstream airplane, a Sikorsky helicopter, a school bus, and work vehicles linked by guide lines. Paddlefish cruise the open water alongside catfish and schooling trout.
Upright Sikorsky helicopter hull on the quarry floor
Grumman airplane fuselage and vehicle wrecks rigged for penetration practice
Resident paddlefish and koi congregating near entry docks
Deep basin configured for decompression and extended-range training
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
Late spring through autumn brings warmer surface water for wetsuit diving, though drysuit divers use the site year-round.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| American PaddlefishPolyodon spathula | Common | ||||||||||||
| Rainbow TroutOncorhynchus mykiss | Common | ||||||||||||
| Channel CatfishIctalurus punctatus | Common | ||||||||||||
| Largemouth BassMicropterus salmoides | Common | ||||||||||||
| Koi CarpCyprinus rubrofuscus | Common |
Marine forecast
