Steelhead Spawning and Incubation Periods. (a) Steelhead Spawning Periods—The steelhead spawning period shall be March 15 through June 15 each year. This total spawning period shall be divided into three subperiods which correspond to the months, or portions thereof: March 15 - 31, April 1 - 30, and May 1 through June 15 which shall be treated as separate spawning groups for the purpose of determining succeeding steelhead incubation flows. The spawning subperiod of March steelhead shall start at 0001 hours on March 15 and shall end at 2400 hours on March 31. The spawning subperiod of April steelhead shall start at 0001 hours on April 1 and shall end at 2400 hours on April 30. The spawning subperiod of May and June steelhead shall start at 0001 hours on May 1 and shall end at 2400 hours on June 15.
