Bridge 3-558 on S417 Daisey Road over Pocomoke River
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[Location Map] Welcome to the Delaware Department of Transportation's virtual workshop. This is a workshop regarding the replacement of Bridge 3-558 on Daisey Road (S417) over the Pocomoke River. Located just east of Gumboro in Sussex county, Bridge 3-558 was identified by DelDOT's Bridge Management Section as being in need of replacement.
[North Elevation ] and [South Elevation] Bridge 3-558 consists of two structural steel plate arches that each span 20'-0" and rise 7'-4". Plate arches bear on pile caps that incorporate timber piles extended into the soil below for support. Br 3-558's existing structure has been in service for nearly 45 years.
[Looking Upstream (North)] and [Looking Downstream (South)] The Pocomoke River flows from north to south as it passes under Daisey road. At the location of Bridge 3-558 the Pocomoke River is just beginning and the stream is a relatively straight natural channel free of debris. Channel slopes are gradual and fairly well stabilized with some minor degradation. The Pocomoke River at this particular location is bound by grass maintenance strips and cultivated agricultural fields.
[General View Beneath Span] and [Deficiency Easily Perforated] and [Deficiency Existing Perforation] The plate arches of Bridge 3-558 consists of galvanized steel. Although most of the steel has held up well during its service life, areas near the waterline have experienced loss of galvanization and consequently the formation of heavy rust scale and section loss has occurred. Areas that have experienced significant corrosion and rust scale are now either very thin weak sections that are easily perforated with a hammer or are already exhibiting complete loss of the steel section. Deterioration and loss of section reduces the plate arches ability to retain soil and support loads. These issues will eventually lead to the inability of the existing pipes to carry the required traffic load of Daisey Road. It is important to note that the bridge remains safe to carry normal traffic at this time, however due to its significant deterioration and continued structural deficiencies, a full bridge replacement is warranted.
[Bridge Plan, Section and Elevation] and [East Approach] As seen on the bridge plan, section and elevation sheet, DelDOT proposes to replace the existing steel plate arches with a 62'-0" single span structure. The superstructure will consist of precast, prestressed concrete box beams. Beams will bear on a cast-in-place stub abutment and will be supported by precast concrete piles.
The use of precast (built off-site) elements incorporated into the structure will decrease the amount of time needed for construction, thus reducing the amount of time for road closure and public inconvenience.
Along with the single span concrete bridge, concrete barriers and wing walls will also be added to the proposed structure for safety, fill retention, and reduced need for right of way acquisition.
New guardrail that meets current design standards will replace existing guardrail on all four corners of the proposed bridge and will transition into the concrete barriers. Guardrail and barriers will help protect vehicles from possible hazards located off the roadway.
During the bridge replacement, Daisey Road will be realigned slightly to meet current AASHTO geometric roadway design standards. The realignment will allow for the radius of the curve over the bridge to be more gradual than the existing conditions.
Additionally, riprap will be placed in the streambed and along the side slopes to protect the proposed bridge and prevent scour or erosion of the stream channel. This work should take approximately 60 days to complete and is scheduled to occur during the spring of 2016.
[Detour Plan]During construction, Daisey Road will need to be closed in the location of Bridge 3-558 in order to perform the proposed bridge replacement and roadway realignment. As shown on the detour plan, a temporary detour route has been planned to accommodate those who will be impacted by the road closure.
[Detour Map] This detour map more clearly illustrates the route that thru-traffic will take during the temporary road closure. Motorists will be given advance notice of the closure on approaching adjacent roadways, including millsboro highway (SR 26). Motorists traveling from both directions towards BR 3-558 will be directed to the south along Cypress Road (SR 54). Local access will be maintained on Daisey Road on either side of the bridge to accommodate local residents, farms and businesses.
[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, minor permanent and temporary easements will be needed from adjacent property owners in order to complete the work.
Permanent easements will be required for the placement and maintenance of rip-rap placed along the stream. The rip-rap 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 permanent easements for site grading, stream diversion and practicality of construction. These areas will be restored to their natural condition upon completion of the work. A real estate representative will contact the affected property owners very soon to explain the department's real estate process.