Impervious surfaces (roads, parking lots, buildings) cover about 60% of Thornton Creek's watershed. That makes for large areas where rain can't soak into the ground, so greater quantities of water rush down Thornton Creek all at once. Last winter, more culverts sustained storm damage in Thornton Creek than in any other Seattle watershed. The culvert at NE 105th and 27th Ave was subsequently replaced with a 16-foot-diameter, fish-friendly design approved by Washington Department of Fish and Wildlife. It's shorter in length and larger in diameter than the old one, and it has a natural streambed inside it. Check it out when you're out that way.
Creek Peek for Kids
Hey kids, can you figure out what a culvert is from the paragraph above? Answer: Pipes or tunnels that carry streams underneath roadways and railroad beds are called culverts.
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