A USGS researcher conducting a metabolism modeling study using a sonde, on the Colorado River below Glen Canyon Dam
A USGS researcher conducting a metabolism modeling study using a sonde, on the Colorado River below Glen Canyon DamA USGS researcher, Bridget Deemer, conducting a metabolism modeling study using a submerged sonde, on the Colorado River in Glen Canyon below Glen Canyon Dam. Photo by Freshwaters Illustrated for USGS.