Efforts continue to improve habitat in the Sacramento River for endangered Chinook Salmon and Steelhead Trout. Additional spawning habitat is being built under the Market Street Bridge in Redding, with more than 8,000 tons of gravel being placed on the riverbed. The $500,000 project is funded by the U.S. Bureau of Reclamation and the U.S. Fish and Wildlife Service. The additional gravel is necessary because low water has prevented the usual moving around of the existing spawning gravel. The project should help all four runs of Sacramento River Chinook. The Winter Run, threatened with extinction, should last from late April through June.