Images

Washed out bridge on the Rio Grande de Arecibo, Puerto Rico after Hurricane Georges, 1998

View looking up-stream toward Carraizo Dam in Loiza, Puerto Rico, under drought conditions.

Water flow in the underlying cavity associated with Ledges Sink.

Logs that fall through the overlying bedrock litter the cavern floor.

Roots break through the overlying bedrock of the cavern.

Flow conditions near Ledges Sink.

Ledges Sink.

Wil Causseaux climbs through the opening of Ledges Sink to the underlying caverns.

USGS researchers at work at Shark River, Everglades National Park.

Alligator in Everglades Park, Florida.

Peace River near Bartow gage --flowing at 29 cubic feet per second on June 16, 2006.

Peace River near Bartow gage -- dry on February 27, 2009.

Installing staff gage at Kissengen Spring, 2006.

Flow from a storm event fills up a buried karst feature along the dry riverbed , June 12, 2006.

South of Peace River at Wabash--flowing at 1 cubic feet per second on May 11, 2007.

Peace River near Bartow gage --flowing at 4.62 cubic feet per second on April 11, 2006.

Peace River near Bartow gage-- dry on May 4, 2006.

Kissengen Spring flooded from Peace River backflow after 3 hurricanes passed through the area, October, 2005.

Upward flow emerging from Otter Sink, January 2006 (located next to Kissengen Spring).

A mud puddle overlies the clay-filled spring vent of Kissengen Spring, April 2006,.

Anhingas are considered primitive birds because they do not produce oils like ducks and other water fowl. They must dry their feathers periodically in order to fly or even remain buoyant, so they remain perched for significant periods of time with wings outstretched.