It’s been just over a year since a century-old dam was removed from Mill Creek, a tributary that runs through the Santa Cruz Mountains in Central California. Now, scientists say the creek is already beginning to show signs of revitalization — including an unexpected discovery.

Aquatic ecologists with the Sempervirens Fund, one of the conservation groups that co-owns the 8,532-acre forest known as San Vicente Redwoods, found 12 juvenile steelhead trout and 15 federally endangered coho salmon fry swimming in the creek last month. It was the first time the latter species had ever been recorded there. v