This weekend is shaping up to be one of the busiest construction periods of the summer in the Puget Sound region. This coming weekend is shaping up to be one of the busiest construction periods of the summer across the Puget Sound region, according to WSDOT. If you plan on driving, major closures on I-405, SR 520, I-5, and SR 202 will likely affect your route. Seattle: Eastbound SR 520 (North Capitol Hill / Montlake)Where:Eastbound SR 520 closed from I-5 to Montlake Blvd. WSDOT map showing one of the busiest construction weekends of the summer in the Puget Sound region.