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Virtual Workshop

Seashore Highway (BR3-113)

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Photos:  North Elevation | West Approach | General View | Upstream | Joint Separation

[Location Map] Bridge 3-113 has been identified by DelDOT's Bridge Management section as being in need of replacement. The bridge is located on Seashore Highway over Iron Mine Branch, Southwest of Greenwood in Sussex County.

[North Elevation & 3-113 West Approach, looking East] Bridge 3-113 consists of two 4 foot diameter corrugated metal pipes with a total length of approximately 100 feet. The channel is very straight and narrow. It is well stabilized with heavy vegetation.

[Existing Perforation] The metal pipe of this bridge consists of galvanized steel and has been in place for approximately 20 years. Although most of the pipe has held up well, areas on the pipe have experienced heavy rust. Because of this, there has been a significant loss of metal at some of these areas.

[Joint Separation] Similarly, significant separation has occurred at some of the pipes' joints. joint separation and loss of metal and the resulting holes will eventually lead to the inability of the pipe to carry the traffic load of seashore highway. It is important to note that the bridge remains safe to carry normal traffic at this time, however significant corrosion, deterioration and continued structural deficiencies warrant a full bridge replacement.

[Bridge Plan, Section and Elevation] As seen on the bridge plan, section and elevation sheet, DelDot proposes to replace the existing metal pipe structure with two 5-foot reinforced concrete pipes. Additionally, riprap will be placed into the stream bed and along the side slopes to protect the proposed bridge and prevent scour or erosion of the stream channel. Guardrail will be replaced where needed to match existing conditions. This work should take approximately 40 days to complete and is scheduled to occur during the spring or summer of 2015.

[Detour Plan] During construction, the road will be closed in order to perform the proposed work. As you can see, a temporary detour has been planned to accommodate the traveling public.

[Detour Map] This map more clearly demonstrates the route that thru-traffic will take during the temporary road closure. Motorists will be given advance notice of this closure at ray road, Northwest of Tull Road, and prior to reaching Seashore Highway (sr404) on cross streets in between Ray Road and Tull Road. from the Northwest, motorists on Seashore Highway (sr404) will be directed left onto Scotts Store Road (s36), right onto Sussex highway (U.S. 13), and then right onto Newton Road to Seashore highway (sr404). From the south, motorists on Seashore Highway will be directed right onto Newton road, left onto Sussex highway (U.S. 13), and then left onto Scotts Store road to Seashore highway (sr404).

[Construction Plan] Although DelDOT strives to perform as much of the work as possible within the department's existing right-of-way, sometimes the nature of the work requires a larger area than what is provided. That is the case for this project. As can be seen on the plan sheet, right-of-way and easements will be needed from adjacent property owners in order to complete the work. Right-of-way will be required for the placement and maintenance of the pipes and rip-rap in and around the stream. Rip-rap at the bridge will be buried and covered with streambed material in the stream, or topsoil, grass seed, and mulch on the stream banks. Temporary construction easements will be needed beyond the right-of-way for construction equipment and stream diversion decreases. Sandbag dikes will be used to divert the stream flow around the work area to provide a dry construction zone to complete the replacement. These areas will be restored to their natural condition upon completion of the work. A real estate representative will be in contact with the affected property owners to explain the department's real estate process.