Images

Outcrop of the Madison Limestone in Spearfish Canyon in the northern Black Hills of South Dakota. The Madison Limestone is a massive, gray to buff limestone with some dolomite.

Precipitation gage 434534103290500, Mt. Coolidge near Custer, SD

A Western Prairie Fringed Orchid, use to be common in the Great Plains but now it is endangered.

Gage House 05114000 located near Sherwood, North Dakota along the Souris River. USGS personnel were there there to measure the streamflow. The picture to the left was taken on April 11, 2011, streamflow of approximately 2,790 cubic feet per second and a stage approximately 18.91 feet. The picture to the right was taken on June 22, 2011.

USGS researchers made microgravity measurements to determine groundwater-storage changes in the karstic Madison aquifer in the Black Hills of South Dakota during 2009-12. The absolute-gravity measurement was made at a station located on top of Terry Peak in the northern Black Hills.

Increase flow in the Des Lacs River and warmer temperatures probably
caused instability in the area of the ice spikes causing them to disappear.

U.S. Geological Survey participiated in a flyover of the Devils Lake Basin to view continued severe flooding.