All The Fish

Back to School

New culvert to benefit future generations of fish, Southeast Alaskans

U.S.Fish&Wildlife Alaska


a bus drives over an arched culvert through which a salmon stream passes
Salmon swim through a new channel-spanning arch culvert over Peterson Creek in Sitka, Alaska while a bus takes kids to school overhead. 📷 Sitka Conservation Society/Lione Clare

Sitka, Alaska — Peterson Creek is a classic Alaska creek: it’s where new generations of salmon, char, and other fishes start life. Specifically, Peterson Creek happens to be home to Coho Salmon, Pink Salmon and Dolly Varden char.

A fish passage project here was recently completed…just in time for salmon returning to spawn and Sitka’s youth returning to school.

Salmon migrate under a culvert over big gravel
Pink Salmon move up Peterson Creek through the new culvert. 📷 Sitka Conservation Society/Lione Clare

Culverts placed where roads cross streams can pose barriers to fish if not designed with fish behavior and flow in mind: they’re often undersized in relation to the creek’s width, and placed atop (instead of embedded in) the streambed. This makes it difficult for fish — especially juveniles that aren’t strong swimmers yet — to move up or downstream through the crossing. Peterson Creek had two such culverts.

a stream pours out of 3 round culverts
Example of undersized, perched culverts constricting a stream’s flow and presenting jump and velocity barriers for juvenile fish and other weak swimmers. 📷 USFWS/Katrina Liebich
a small spotted fish in a net
A Juvenile Dolly Varden from Peterson Creek netted and safely transported out of the construction zone by the Alaska Department of Fish and Game. 📷 Sitka Conservation Society/Lione Clare

“If there’s one thing that Alaskans can rally around, it’s salmon. These projects are a win-win for both salmon and infrastructure stability in communities.” — Andy Stevens, Fish Biologist, U.S. Fish & Wildlife Service

With community support from the Sitka Economic Development Association, Sitka Chamber of Commerce, and Sitka Conservation Society, and assistance from the Alaska Sustainable Salmon Fund, the U.S. Fish and Wildlife Service, City and Borough of Sitka, and Marble Construction came together to restore fish passage where Peterson Avenue crosses Peterson Creek.

construction works install a new culvert
Peterson Creek flows through a temporary channel (left) while the new fish-friendly arch culvert was installed. 📷 Sitka Conservation Society/Lione Clare

“Fully community-supported projects are the right way to do infrastructure projects when living in a salmon landscape” — Andrew Thoms, Executive Director, Sitka Conservation Society

This new culvert is designed to accommodate not just the variable swimming abilities of fish, but also the creek’s full range of high and low flows. This kind of design also promotes the normal movement of logs, rocks, leaves and other natural materials found in and along the creek (movement of which create habitat and feeding opportunities for fish and their prey).

a school of small spotted brown fish in shallow water
Juvenile salmonids school amongst rocks in a shallow Alaska stream. 📷 USFWS/Katrina Liebich

“Salmon need uninterrupted routes from the ocean to their spawning grounds. Roads and dams are inevitable, but have made this difficult. Incorporating affordable infrastructure like this makes it much easier for salmon to retain a greater portion of their habitat, even in developed areas.” — Dan Kirsch, Project Manager, Professional and Technical Services, Inc.

Fish splash through an arch culvert
Salmon splash upstream past the new culvert. 📷 Sitka Conservation Society/Lione Clare

Culverts sized and placed with intention also benefit people. Where undersized round culverts placed on top of the streambed are more likely to create a plunge pool downstream and “blow out” under the force of a flood, fish-friendly arch culverts and bridges that span beyond the channel to accommodate high flows can handle flood conditions better.

That means safer routes to and from home and school, and fewer (if any) delays during a storm/flood events.

Fish are a key part of peoples’ ways of life in Sitka and all of Alaska, feeding families and forests, and sustaining communities, economies, and the entire environment.

a man stands by a river bank in boots
A man stands along the bank of a Southeast Alaska salmon stream. 📷 USFWS/Will Rice

“Finding a balance between protecting salmon habitat and supporting development in communities is important so both can continue to coexist. Salmon habitat is important to protect to maintain healthy salmon populations that support communities through food resources, jobs, and tourism…” — Jesse Lindgren, Alaska Department of Fish & Game Habitat Biologist

For Peterson Creek, one barrier remains just a few hundred feet upstream at the intersection of Wachusetts Street. To continue improving and making Sitka’s streams healthier and roads more resilient for the future, partners plan to remove this barrier too, and reconnect downstream habitat to important upstream habitat in the headwaters of Peterson Creek.

The U.S. Fish and Wildlife Service’s Fish Passage and Partners for Fish and Wildlife Programs allow the flexibility to do restoration on non-federal lands. This makes working relationships with partners like the Sitka Conservation Society, municipalities like Sitka, or even private landowners a possibility.

Story jointly created by Katrina Liebich, Digital Media Manager for the U.S. Fish & Wildlife Service and Lione Clare, Storytelling & Outreach Specialist for the Sitka Conservation Society & Sustainable Southeast Partnership, with Andy Stevens, Fish Biologist, Anchorage Fish and Wildlife Conservation Office.

As the Service reflects on 150 years of fisheries conservation, we honor, thank, and celebrate the whole community — individuals, Tribes, the State of Alaska, sister agencies, fish enthusiasts, scientists, and others — who have elevated our understanding and love, as people and professionals, of all the fish.

In Alaska we are shared stewards of world renowned natural resources and our nation’s last true wild places. Our hope is that each generation has the opportunity to live with, live from, discover and enjoy the wildness of this awe-inspiring land and the people who love and depend on it.

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