Dungeness/Towne Rd Levee Updates
Lower Dungeness Levee Project Update, February 12, 2024
Design work. The project engineers have been moving ahead with design details. I am happy to report the redesign work indicates the levee surface will be able to accommodate more useable space than originally thought. The following figure shows the project layout and includes two sectional designs representative of the narrow (Section B-B’) and the wider (Section A-A’) portions of the project:
By reducing the project design speed from 35 mph to 25 mph, greater flexibility exists with respect to lane widths and other design criteria. With a minimum of 10-feet from the fog line to the slope edge and a consistent slope to the outside, it was feasible to remove one of the guard rails and still meet safety requirements. A curb will be used to provide vehicle/pedestrian separation—offering a more open feel for both. Smaller-aggregate chipseal may be used on the road surface to reduce road noise and provide a smoother surface. A roadside parking strip has also been included south of the levee surface for additional pedestrian access.
Now that we know how much surface width we have to work with, we have a better understanding of how the surfacing and space allocation will work throughout the length of the project. The “narrow” portion depicted in Typical Section B-B’, includes a 14-foot north-bound lane, a 10-foot south-bound lane, and a six to eight-foot trail surface. The duration of this segment is limited to approximately 350-feet of the 3,700-foot project distance, or about 9% of the over-all project. An intermediate portion will exist for approximately 850-feet and contain a 14-foot north-bound lane, a 12-foot south-bound lane, and an eight to ten-foot trail surface. The majority of the project (68%) will have two 14-foot travel lanes and 10 to 12-foot-plus trail surface. The trail surface will provide a nexus between the North Levee and the River’s Edge Levee to the south. These design features are still preliminary, but it is expected they provide the general layout that will be included in the final design.
Next steps. The next step involves the completion of the engineer’s plan set, which is anticipated in about a month. Additional modifications will likely be needed to adjust the design to fit local needs and preferences. At this point, staff feels the project will be ready for bid proposals at the end of March. Assuming a reasonable bid is received and approved, construction is expected to occur this summer. More information will be provided on the project schedule and budget as this process evolves.
Other Levee Updates.
Washington Conservation Corps crew planted about 2,000 native plants and installed a fence around the most vulnerable newly seeded area near the walking ramp in the north parking lot. This is the second planting of native plants in the floodplain area. Many thanks to this hard-working crew!
This year you may see people out in the floodplain with something that looks like a butterfly net. These folks are looking for some of Washington’s 600 species of native bees. They will record the species, location, and other information to add to the Washington Bee Atlas. https://agr.wa.gov/departments/insects-pests-and-weeds/insects/apiary-pollinators/pollinator-health/bee-atlas
(Western Leafcutter Bee)