© Celin Serbo. Above:  Laura Shultz crosses Boulder Creek during peak run-off on a Tyrolean Traverse near Boulder, Colorado.

“This image was taken after a day of rock climbing in Boulder Canyon. Tyrolean traverses are the standard to access climbs on the south side of the canyon. Most of the year the scene is relatively tame but from May through June the spring run-off can create a dramatic scene. To cross you simply attach your harness to the fixed lines and pull yourself across. The scene was completely in the shade so I used a strobe out of frame, camera right, to provide subtle backlight and subject separation,” says Serbo. Celin Serbo is an outdoor adventure sports photographer based in Boulder, Colorado.