By using this site, you agree to its use of cookies as provided in our policy.

Rowena Gap - a hydraulic dam
Posted by: Groundspeak Premium Member Rose Red
N 45° 40.969 W 121° 17.941
10T E 632460 N 5060214
Quick Description: Rowena Gap is one of many hydraulic dams encountered by the Missoula Ice Age Floods.
Location: Oregon, United States
Date Posted: 4/8/2012 5:49:19 PM
Waymark Code: WME66Y
Published By: Groundspeak Premium Member bluesnote
Views: 6

Long Description:
Located at the northeast side of Tom McCall Point, Rowena Gap is one of many hydraulic dams encountered by the Missoula Ice Age Floods. The gap formed where the river cuts through the Columbia Hills anticline. The bottleneck piled up waters from the floods to heights reaching 1,000 feet. Flood waters backed up from Rowena Gap to as far away as present day Maryhill Museum (about 18 miles as the crow flies). As the Missoula floods exited The Dalles basin, they eroded the Columbia River Basin at river level, forming the scabland visible along the freeway, and also etching a prominent trimline on the southwest flank of the Columbia Hills anticline at about 1030±40 feet, descending to about 950±40 feet where flow entered the constriction (adapted from Jim O’Connor and Richard Waitt, Field Trip of IAFI, 2007).
Visit Instructions:
You must actually visit a feature to post a log for it. You must post a picture that you have taken at the feature to have the waymark approved. It has to be in one of the states listed above.
Search for... Google Map
Google Maps
Bing Maps Maps
Nearest Waymarks
Nearest Glacial Lake Missoula Flood Features
Nearest Geocaches
Nearest Benchmarks
Nearest Hotels
Create a scavenger hunt using this waymark as the center point
Recent Visits/Logs:
There are no logs for this waymark yet.