The lawsuit is the second this summer in which environmentalists are pushing Arizona for tougher action to limit, or block, groundwater pumping near the imperiled river.
Marana police say the driver of an SUV ran a red light at Ina Road and Interstate 10 Wednesday evening and collided with a motorcyclist in the intersection.
A reconstruction and widening project of I-10 southeast of downtown is expected to address traffic congestion, improve safety and increase traffic flow.