Motorists traveling south on Route 113 next spring may get the, let’s say, opportunity to take a scenic tour of parts of Millsboro.
The Delaware Department of Transportation (DelDOT) sent representatives to the July 2 regular meeting of the Millsboro Town Council to discuss plans to fix a series of concrete-encased steel beams on concrete abutments attached to a bridge over Iron Branch, in close proximity to the Hardee’s on the highway.
DelDOT has looked at two plans to do the repairs: The first would involve lane closures and would take approximately eight months to finish. The second, which DelDOT and town officials have said they prefer, would involve closing down part of southbound Route 113, detouring motorists along Radish Road to Hickory Hill Road, then to Handy Road and back to Route 113. That second plan would take about two weeks to complete.
“It will be a lot of pain,” explained Jason Hastings, state bridge engineer for DelDOT. “But it’s for a short time.”
How we got here
The core of the bridge was originally constructed in 1916, to carry the then-new T. Coleman du Pont Highway over Iron Branch in Millsboro, according to DelDOT. That bridge was later modified two more times, to accommodate wider shoulders and to dualize the highway.
According to Hastings, each bridge in Delaware is inspected every two years, and it was discovered that the steel beams on this bridge “have significant corrosion and loss of section,” according to DelDOT’s website.
“The concrete frame and concrete abutments have some delamination [a mode of failure for composite materials and steel] and spalls [splinters]. The existing structure is structurally deficient and was selected by the Pontis Bridge Management System for work.”
“Each year, we create a prioritization list that is ranked based on a deficiency formula that accounts for bridge condition and roadway functionality,” explained Hastings. “We program the top 125-150 bridges for work, whether capital contracts (such as this project) or maintenance activities.”
The existing bridge is ranked 72nd on the 2018 DelDOT Bridge Deficiency List, according to the department’s website.
DelDOT will host public workshops on the proposed rehabilitation project, to both present details of the project and solicit feedback from the public, according to DelDOT. A live workshop will be held at Millsboro Town Hall & Civic Center on Thursday, July 26, from 4 to 7 p.m. A virtual workshop will be available online.
The full notice for the hearing is online at https://deldot.gov/About/publicevents/workshops/index.shtml?dc=workshop&....
Interested persons are invited to express their views either online or in writing, according to DelDOT. Comments will be received during the workshop, or can be mailed to DelDOT Community Relations, P.O. Box 778, Dover, DE 19903, or can be emailed to firstname.lastname@example.org.
Hastings said he believes the public will agree that the two-week plan, though more dramatic and inconvenient than the eight-month plan involving lane closures, is more efficient and advantageous.
“If there is significant backlash at the public workshop, we would re-evaluate,” said Hastings, “but I don’t anticipate that happening.”
Hastings said the estimated total cost of the project — including construction, contingency and construction inspection — is $1.5 million. Hastings also said that all businesses and homeowners beyond the closure will have access maintained throughout the duration of the project.
“In fact, the detour we chose allows U.S. 113 traffic to stay on 113 as long as possible, keeping easy access to the businesses.”
If the project gets the final thumbs-up and moves forward, DelDOT expects the design work to be completed by the end of this summer, and the construction has to be finished no later than the spring of 2019.
The actual construction phase of the project would involve the continued use of steel beams, but they would no longer be encased in concrete, according to Hastings.
“The widened portion of the structure [under the median and northbound side] is a three-sided concrete frame, which is an economic and durable structure for this structure size,” said Hastings. “The replacement portion of the structure on the southbound side will be a three-sided concrete frame to match the remaining structure.”
By Darin J. McCann