Steelhead trout

Colgan Creek needs lower water temperature. As we restore the trees and plants that provide shade, we can expect water to gradually cool and to provide better habitat for fish such as steelhead trout.

Most fish now in Colgan Creek are non-natives that can survive in the worst warm water conditions. Improving water quality in Colgan Creek—which flows into the Laguna de Santa Rosa—will benefit salmon and trout in the Laguna and Russian River.

Aquatic Insects

Adult Stonefly

Adult mayfly

When 3 key aquatic insects appear, then conditions are right for fish and other species whose life cycle depends on them: 1. mayflies, 2. caddisflies, and 3. stoneflies.
Where we find these indicators species of insects thriving in Colgan Creek, we will also find good water quality and food for trout.

Adult Caddisfly

Fish and Gardening?

You may not think of fish when you slip on your gardening gloves, but your yard work habits can have a big impact on aquatic life. For healthier creeks, replace chemical pesticides with insects that will work hard for you, helping you create an organic garden—healthier for you, too!