Claire Corlett

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Fish Passage Construction – Caltrans News Flash #215

Fish Passage Construction – Caltrans News Flash #215


Hi I’m Andrew Goetz with Caltrans News
Flash. Behind me you can see crews working on the installation of a
bottomless precast concrete arch, the first of its kind here in District 1. In
a moment we’re gonna head down there and find out what makes this bottomless
precast concrete arch so different. Two steel culverts needed to be removed at
Ritmer Creek just north of Crescent City which presented an opportunity for
Caltrans construction project to install this new bottomless arch and improve
fish passage. So this precast concrete arch comes out here in segments. As you can see behind me we’ve got these precast concrete arch segments and the
foundation segments. It’s very modular. We’ve also got the
wing walls and head walls that come in in separate pieces and we’re able to
piece this thing together in a very short amount of time. I think this stage
of construction was completed in about four hours. So a large portion of the
structure is actually going to be buried and you won’t see most of it. We’re going
to be bringing in natural stream bed material here up to the existing grade
of the creek and it’ll be to approximately five feet above where
we’re standing now. Some older culverts like the one at Ritmer Creek can restrict
the movement of fish and other wildlife. Fish passage, reconnecting fish, reptiles
and animals to their natural habitats along the waterway will be enhanced with
this new bottomless culvert. At Ritmer Creek we had two culverts that needed to be replaced and removed and so in this case we decided to use a precast arch
culvert option to span the channel and to provide a natural stream bottom
channel allowing for the continuity of the system and the migration of the
organisms that we are concerned with. Each fish passage location is is unique.
We will have to take into consideration what organisms that we’re designing for
for each location and geomorphology for each location, also the hydrology or the
amount of water and the hydraulics or the roughness the physical features of
the channel. For Caltrans News Flash, I’m Andrew Goetz.

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