Located at the Pasco Airport; Bergstrom Aircraft offers a unique way to see many flood features. It truly is the best way to see some kinds of features; and may be the only way to see others.
The unique geology of the Tri-Cities area is a hard-edged basalt and lava landscape carved by the great Ice Age Floods between 18,000 and 12,000 years ago. During the largest of those floods the Tri-Cities lay under 900 feet of floodwater (i.e., Lake Lewis) that backed up behind the hydraulic constriction at Wallula Gap. During this time the tops of the local hills (e.g., Badger and Candy Mountains) were “islands” poking out above Lake Lewis. The high water mark for the floods in the Pasco Basin (1200 ft elev.) is based on the maximum observed height of erratics, which is coincident with channeling at Wallula Gap.
The Wallula Gap (near Tri-Cities) was one of the most significant natural features during the Ice Age Floods. After having spread out over hundreds of miles of the Channeled Scablands, all the floodwaters from glacial Lake Missoula were funneled through this single narrow opening only a few miles wide. More water entered the Gap than could pass through, so the water backed up, forcing floodwaters up the Yakima and Walla Walla river valleys and submerging Yakima and Walla Walla under hundreds of feet of water, while the backwaters rose to around 900 feet over the Tri-Cities.
Schedule a flight very early in the day – within a few hours of dawn – so that the low-angled light accentuates the contours. Evening hours also work as well, when the giant ripple features just jump out at you under a low-sun.
Visit their website for more information, then call 1-509-547-6271 to book your exclusive Ice Age Floods Aerial Adventure! Bergstrom Aircraft is an IAFI sponsorf.