Investigators may never know for certain what sparked the fire on the left side of the U-shaped assisted living facility.

The deadly blaze was either started by a malfunctioning oxygen concentrator or smoking materials in a resident's room, authorities said.

Often called Canoeing's Greatest Race, this event fills the AuSable River with sleek, carbon-fiber racing canoes.

The group of six who accidentally floated to Dillon Falls on the Deschutes River near Bend were in inner tubes tied together and included a Texas woman who had just celebrated her 40th birthday and a 33-year-old woman from Florida, authorities said Tuesday.

Papp jumped into the water on the 100 block of North Water Street at about 10:44 p.m. on July 20, the police said in an email. Papp's body was recovered the next day at about 12:45 p.m.Get daily updates on the Packers during the season.

The Lower Passaic River has a history of pollution that stretches back into the 1950s. According to the National Oceanic and Atmospheric Administration ( NOAA ), the river was polluted by byproducts from the chemical herbicide Agent Orange—a substance best known for its use by the American military in the Vietnam War.

Water levels on the Arkansas River have returned to normal after months of high water and fast flows that impeded commercial and recreational use of the waterway. The change has left local port officials and recreational boaters hopeful despite commercial tonnage on the river being down nearly 20% compared to last year.

The Santa Cruz River, dried up and polluted, came back to life recently, sustained by highly treated wastewater from two water reclamation facilities.