Up to 1,000 non-native fish died in the Lower Santa Cruz River, a retired fish biologist says, because a state contractor diverted river water for an Ina Road bridge construction project. The diversion moved the river’s treated sewage effluent from the west bank to the east bank, away from the towering, shady willow trees along the west bank. It ended Friday, a little more than a week after it started, when the contractor dug a new channel near the bridge site to reverse the effluent’s course back to the west bank. The diversion “was a necessary part of the construction,”...