Yuba Water Agency is set to increase the water flows on the Yuba River below the New Bullards Bar Dam starting September 29. Officials say the change is part of the Colgate Tunnel and Penstock Improvement Project. … Parker explained that due to taking the powerhouse offline, the water flow will be higher than normal. Yuba Water Agency urged local recreators to avoid the area or exercise extreme caution. … Starting Monday, the flow will increase to about 900 cubic feet per second.