| Area | Geyserville |
| Topic | Tour: Construction of Healdsburg Dam and Fish Ladder |
The boulders in the near ground of this photo are part of the foundation for the recreational swimming dam at Healdsburg's Memorial Park. This seasonal dam has been controversial because of problems with fish passage. In response, Sonoma County acquired funds to build a fish ladder to facilitate fish migration at all flows. The boom downstream is the first step in setting up a coffer dam and beginning construction. Photo provided courtesy of the Sonoma County Water Agency.
With the coffer dam complete, construction workers begin use of a large crane to start to build the foundation for the new ladder. Photo provided courtesy of the Sonoma County Water Agency.
Large iron piers have been driven into the river bed to start the foundation for the new fish ladder at Healdsburg's Memorial Beach. Photo provided courtesy of the Sonoma County Water Agency.
This photo shows the foundation for the ladder, including metal piles driven into the river bed. Photo provided courtesy of the Sonoma County Water Agency.
Large wooden forms are put in place to form a frame for pouring the cement for the fish ladder. Photo provided courtesy of the Sonoma County Water Agency.
This picture shows the final frame for the fish ladder constructed. Note the extensive use of rebar in the form for structural reinforcement. Photo provided courtesy of the Sonoma County Water Agency.
This photo shows the completed fish ladder looking upstream. This ladder not only provides access when the recreational dam is up but also past the rip rap that supports the dam during high or low flows. Photo provided courtesy of the Sonoma County Water Agency.
Closeup of completed fish ladder. The overall design provides attraction flows but also very easy passage. Photo provided courtesy of the Sonoma County Water Agency.
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