Marin Municipal Water District was halfway through a two-year project to improve floodplain in lower Lagunitas Creek on Aug. 22 when it was treated to a surprise: a rare chum salmon swimming through a channel that had just been excavated.
It was the first time the district has spotted salmon before October. Chum have been seen in the creek before, though they are more commonly found in Oregon and Washington and it’s coho and chinook…