Accelerated Bridge Construction
University Transportation Center

ABC Project and Research Databases

2016 – Strodes Mills Bridge

Year ABC Built: 2016
State: PA
County: Mifflin
Owner: State
Location: Rural
Spans: One-span
Beam material: Steel
Max Span Length (ft.): 50
Total Bridge Length (ft.): 54
Construction Equipment Category: Conventional
ABC Construction Equipment: conventional
State ID Number: 44 4013 0050 0000
NBI Number: 53378
40.568409 | Longitude: -77.6759796

Under Construction

Bridge Description

Project Summary:

Used Folded Steel Plate Girder modular decked beam elements

Project Location:

State Route 4013 over Strodes Run near the city of Lewistown

Impact Category:

Tier 4 (within 1 month)

Mobility Impact Time:

Actual closure was 30 days, compared to the contractor’s estimate of 75 days using conventional construction.

Primary Drivers:
  • Reduced traffic impacts – from detour
  • Reduced onsite construction time


50-ft-long and 31.5-ft-wide single-span Folded Steel Plate Girder bridge; 15º skew

Average Daily Traffic (at time of construction):


Traffic Management (if constructed conventionally):

Extended use of 19-mile detour

Existing Bridge Description:

The existing single-span steel I-beam bridge was 33-ft long and 27-ft wide with spread footing on soil. It had two 12-ft-wide traffic lanes. Built in 1951, the bridge was deteriorated and required replacement.

Replacement or New Bridge:

The replacement bridge has two 12-ft-wide traffic lanes and two 4-ft-wide shoulders. The cross-section consists of four 2-ft-deep Folded Steel Plate Girder modular decked beam elements spaced at 9.5 ft with a 7.5-inch-thick precast 4,000 psi reinforced concrete deck. Decks of the two outside elements were precast complete with railing. Integral abutments were used.

Construction Method:

The existing bridge was demolished and abutments were constructed conventionally by the contractor. Concurrently, the Folded Steel Plate Girder modular decked beam elements were fabricated off site by CDR Bridge Systems. The elements were then delivered to the construction site by truck on the day required by the [on site] contractor, who installed the four elements in 2.5 hours. Following installation, the contractor made three longitudinal closure pours and the concrete end diaphragm closure pour. Approach roadway paving completed the project.


The maximum allowable bridge closure was 35 days due to the 19-mile detour length. Using the Folded Steel Plate Girder modular decked beam elements, the actual closure was 30 days. The contractor had estimated a closure of 75 days using conventional construction methods. The contractor received no incentive for the early delivery; however, an over $15,000 per day liquidated damages provision was in place and avoided by the early completion.


During the project, weekly production conference calls were held, and detailed fabrication/delivery status reports were provided.

Stakeholder Feedback:

During planning, collaboration between CDR, HDR and Walsh/Granite JV resulted in the addition of forming tabs for the concrete end diaphragm. Threaded concrete inserts were included on the bottom of the deck panels to facilitate forming for the longitudinal closure pours. Alterations to future abutment reinforcing were noted to facilitate installation of the exterior girder elements. The change reduced installation time from 3 hours for the FSPG modular decked beam elements on the first bridge (Wrights Corners) to 2 ½ hours on this bridge.

High Performance Material:

Hot-dip galvanized steel girders for corrosion protection; 4 ksi accelerated concrete closure pours; ¾” polyester polymer concrete overlay

Project Planning

Decision Making Tools:
Site Procurement:
Project Delivery: Public-Private Partnership (P3)

Geotechnical Solutions

Foundations & Walls:
Rapid Embankment:

Structural Solutions

Prefabricated Bridge Elements: MDcBs (Modular concrete-Decked steel Beam) - Folded Steel Plate Girder System (FSPGS)
Prefabricated Bridge Systems:
Miscellaneous Prefabricated: CIP reinforced concrete closure joints, prefabricated railing, polyester polymer concrete overlay

Costs & Funding

Funding Source:

Incentive Program:

Additional Information

Downloadable Resources

Contract Plans:


Bid Tabs:

Construction Schedule:

Other Related Information:

Other Related URLs:

Photo Credits:

CDR Bridge Systems LLC


Thomas P. Macioce, P.E.
Chief Bridge Engineer
Pennsylvania Department of Transportation

Folded Steel Plate Girders:
Thomas Stockhausen
CDR Bridge Systems LLC

Girder Fabrication:
American Tank & Fabricating Company

Girder Galvanizing:
AZZ Inc.

Precast Deck Prefabrication:
AC Miller Concrete Products

Mike Heiple P.E.
Project Manager – Central
Walsh Granite Joint Venture

Thomas Stockhausen
CDR Bridge Systems LLC