Ditches have a mixed impact on Boulder's fish populations

Ditches have a mixed impact on Boulder's fish populations.

Negative Impacts: In the past, ditches diverted most of the water out of our creeks and dried up sections completely. Many native species of fish probably were wiped out. Amazingly, some native fish survived.

Positive Impacts: Ditches have helped fish survive by filling reservoirs, which provided more fish habitat to non-native stocked fish, as well as natives.

Right, from the top:

Duck and painted turtles, photo courtesy of Boulder Open Space and Mountain Parks.

Fish ladder on South Boulder Creek, at a ditch diversion.  Today ditch companies are installing fish diversions on check dams to help fish travel up and down the creek more easily.

Fantastic Fish of Boulder, courtesy of Boulder Open Space and Mountain Parks.

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