SR 99 1st Ave S Bridges - Marine User Survey WSDOT is planning work on the SR 99 1st Avenue South Bridges over the Duwamish Waterway in 2025. This survey intends to collect vessel crossing information from marine users of the Duwamish Waterway so that WSDOT can create a work schedule that will require minimal disruptions.This survey will be easiest to fill out on a computer or tablet, but can also be completed from a smartphone. Question Title * Please tell us your name. Question Title * Please add an email address where WSDOT can contact you for follow-up if necessary. Question Title * Please add a phone number where WSDOT can contact you for follow-up if necessary. Question Title * Which type of user are you/do you represent? Commercial Freight Recreational Other (please specify) Question Title * Please tell us if you're answering for a specific organization or group. Question Title SR 99 1st Ave S bridges over Duwamish Waterway Question Title * Do you use the Duwamish Waterway to travel beneath the SR 99 1st Ave S Bridges? Yes No Next