Twelvemile Creek and East Branch Professional Review and Guide
"These skinny creeks are heavily influenced by runoff and all but dry up in summer and early fall.
Heavy autumn storms, winter thaws, and snowmelt swell these streams to ideal spawning size. Ripe chinooks up to 30 pounds run up both after September and October downpours. Steelhead up to 15 pounds pour in alongside them to feast on fresh caviar. Additional waves of steelhead flow in whenever water levels permit. The state tries ensuring the steelhead return by stocking roughly 37,000 fingerlings into the creeks annually. Chinooks are highly territorial and will savagely strike streamers, spoons, and fresh skein. The rainbows respond with relish to egg sacs and anything that looks like salmon eggs.
In the park, both creeks reach the same gradient as the lake and slow down to a crawl. Largely bordered by marsh, they load up with panfish, especially in spring and early summer. Bullheads can go 2 pounds, bluegills and pumpkinseeds reach the size of small frying pans, and yellow perch can stretch up to 14 inches. Each hits garden worms and red worms fished on bottom. The sunfish and perch will also hit pieces of night crawler floated below bobbers, 1-inch curly-tailed grubs, and wet flies."