New King County road across Mary Olson Creek improves transportation for people and salmon

Update: See video below of fish using the newly restored stream.

Between Seattle and Auburn, drivers cross over countless creeks and rivers. Each fall, salmon and steelhead swim a similar journey from Puget Sound, up the Duwamish River leading to the Green River, and into many tributary streams around Auburn. These creeks are vital habitat for salmon. Streams provide areas for salmon to reproduce, hatch, and grow, so young salmon are plentiful and healthy when they enter the ocean.

After leaving local waterways, salmon and steelhead spend several years in the Pacific Ocean before returning to King County waterways to repeat the cycle.

Just like people rely on roads to cross over creeks as they move throughout the region, salmon and steelhead rely on barrier-free creeks flowing under roads to reach vital upstream habitats.

BEFORE: The culvert that conveyed Mary Olson Creek under Green River Road near Kent.

This summer, King County Roads replaced a culvert carrying Mary Olson Creek under Green River Road near Kent. This project ensured that the road crossing the creek is up to current standards and restores fish passage to Mary Olson Creek. Prior to the project, a metal pipe or “culvert” carried the creek under the road. This culvert was old and in poor condition. It was also too small and steep for most fish to swim through and blocked salmon from migrating upstream of the road.

DURING: During construction to replace the old culvert with a new, wider box culvert.

The new creek crossing uses a box culvert that is wide and deep enough to make sure that the creek under the road is “passable” for all species of fish, including salmon and steelhead. This work opens up more than 2,000 feet of stream habitat to full access by salmon and steelhead.

AFTER: The new box culvert that is wide and deep enough to make sure that the creek under the road is “passable” for fish to access spawning habitat.

The county completed construction of the new culvert in late August and this fall, the county will plant some trees and shrubs along the creek channel to improve habitat conditions. The project, which cost about $900,000, provides a road crossing that benefits all, whether they are people travelling on the road or fish swimming in the creek.

The project is one of many being done by the King County Fish Passage Restoration Program with a goal of getting as many fish to the best habitat as soon as possible. 

For more information about the Fish Passage Restoration Program, please contact
Evan Lewis, Water and Land Resources Division.

UPDATE: This video, taken Nov. 18, 2020, shows chum spawning inside the new Green River Road box culvert into Mary Olson Creek near Auburn. The use of the culvert by fish so soon after construction was completed, shows the success of the design and construction of the project by the King County Roads Division.

Video: Steve Conroy, King County Roads Division

Continue reading New King County road across Mary Olson Creek improves transportation for people and salmon

Semhar’s story (or, how to turn water in to work)


Abraha Semhar

Growing up in Eritrea, Semhar Abraha and her family relied on monthly tankers to fill her community’s water reservoirs.

“Everyone in our community would light up when they heard the tankers blow their horns,” said Ms. Abraha.

There was no tap water in her home and water was limited. Her family used the water from washing dishes to flush the toilets. None of it went to waste.

“I watched my mother manage our drinking water and the water for our small vegetable garden,” said Ms. Abraha. “My father is an economist and always has a way of making things more efficient.”

Ms. Abraha attributes her desire to have a career in water management to her parents.

Ms. Abraha chose to pursue an education in engineering in Eritrea where she worked on government water projects such as designing water harvesting and irrigation structures, diversion structures and water canals.

In her research she learned that Eritrea, bordered by Sudan in the west, Ethiopia in the south, and Djibouti in the southeast of the Horn of Africa, is not actually a water scarce country. But the lack of technology available made water scarce to those who live there.

“Eighty percent of the population are farmers but they aren’t using water efficiently,” said Ms. Abraha.

In Eritrea, Ms. Abraha was working as a junior engineer to help build one of the country’s biggest dams when she decided to pursue a Master’s degree in Civil Engineering and came to Seattle to attend the University of Washington.

After completing her degree, Ms. Abraha became the first trainee in the new Stormwater Services Engineering Internship Program. This pilot program is part of the King County Water and Land Resources Division’s equity and social justice work that is designed to train future engineers from under-represented populations in the field of engineering.

“People here are so collaborative. Everyone is willing to help you and teach you things,” said Ms. Abraha.

During her internships Ms. Abraha trained on survey, CAD and asset management projects and has accepted a 3-year position as an Engineer I in the Wastewater Treatment Division.

Ms. Abraha believes that there may come a time when she returns to Eritrea, perhaps to help build a wastewater treatment plant there, but right now she is busy here realizing her dream.