MID-COUNTY EXWY.NB
over DARBY CREEK
BLUE ROUTE 25K05, Delaware County, Pennsylvania
Condition
GoodYear Built
1990
Daily Traffic
46,663
Length
60 ft
About This Bridge
MID-COUNTY EXWY.NB carries traffic over DARBY CREEK in Delaware County, Pennsylvania. Built in 1990, this structure is 36 years old, built during a period of significant highway expansion. The bridge features steel continuous construction with a stringer/multi-beam or girder design, a combination chosen by engineers to meet the specific requirements of this crossing.
Approximately 46,663 vehicles cross this bridge daily, representing moderate traffic volumes typical of important regional connectors. This level of usage requires regular monitoring to ensure continued safe operation. Commercial trucks account for 10% of all crossings. This proportion of commercial traffic is typical for this roadway classification and is factored into the bridge's design load ratings.
The bridge is currently rated in good condition based on federal inspection criteria established by the Federal Highway Administration. The structure meets current safety standards for its designated use and load capacity. With a total length of 60 feet, this is a shorter span typical of local road crossings, often carrying traffic over small streams, drainage channels, or other roadways.
The construction materials used in this bridge were selected based on engineering requirements, cost considerations, and local conditions at the time of construction.
Federal law requires that all highway bridges be inspected at least every 24 months by qualified inspectors following the National Bridge Inspection Standards (NBIS). Some bridges with known issues or unusual characteristics may be inspected more frequently. Inspection data is reported to the National Bridge Inventory, a database maintained by the Federal Highway Administration that tracks the condition of all public highway bridges in the United States. This bridge data is sourced from that federal database and reflects the most recent available inspection results.
Condition Ratings
Deck Condition
Good
Superstructure
Good
Substructure
Good
Channel & Protection
Satisfactory
Lowest Rating
Determines condition category
NBI condition ratings range from 0 (failed) to 9 (excellent). Ratings of 4 or below are considered poor. The overall condition category is determined by the lowest individual component rating.
With a lowest rating of 7, this bridge demonstrates good condition meeting all safety standards.
For a structure built in 1990, maintaining good condition demonstrates effective maintenance practices. If this bridge were closed, traffic would face a detour of approximately 8 miles, underscoring the importance of maintaining this crossing.
Bridge Details
Steel Continuous is the primary structural material, which influences maintenance requirements and expected lifespan. The stringer/multi-beam or girder design was selected based on span requirements, load capacity needs, and site conditions at the time of construction. Maintenance responsibility falls to State Highway Agency.
Construction
Dimensions
Span dimensions affect structural design choices and load distribution. The deck area of 3,403 sq ft determines surface maintenance scope.
Classification
Status
Traffic Data
Traffic volume data helps engineers assess bridge wear patterns and plan maintenance schedules. Average Daily Traffic (ADT) counts are updated periodically and represent typical weekday usage.
46,663
Avg Daily Traffic (2023)
Vehicles per day crossing this bridge
10%
Truck Traffic
Commercial vehicle percentage
67,047
Projected Future ADT
Estimated future demand
This bridge carries approximately 46,663 vehicles per day, translating to roughly 17,031,995 crossings annually. This moderate traffic level is typical for regional connectors.
Commercial trucks comprise 10% of traffic. Heavy vehicles cause disproportionate wear—a single fully loaded truck can have the impact of thousands of passenger cars on bridge deck surfaces.
Traffic projections estimate future volumes of 67,047 vehicles daily, a 44% increase from current levels. These projections inform capacity planning and potential upgrade requirements.
Load Ratings
Load ratings determine what weight this bridge can safely support. These values are critical for routing heavy vehicles and issuing overweight permits.
Operating Rating
8.1 tons
Maximum allowable load for special permits
Inventory Rating
4.8 tons
Load level for normal traffic
The operating rating of 8.1 tons represents the absolute maximum load this bridge can carry under controlled conditions with special permits. The inventory rating of 4.8 tons is the safe load limit for everyday traffic without restrictions. These relatively low ratings may result in posted weight limits or route restrictions for heavy vehicles.
5-Year Condition Trend
↓DecliningCondition has declined by 1.0 rating points since 2020
Data: 2020-2024 FHWA National Bridge Inventory
Location
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40.847222, -76.475833
Identification
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Data Source: Federal Highway Administration (FHWA) National Bridge Inventory 2024
Bridge inspection data is typically updated every 24 months. Conditions may have changed since the last inspection.
“Structurally deficient” does not mean a bridge is unsafe or likely to collapse. It indicates that one or more key structural elements are in poor or worse condition. Bridges are inspected regularly and may have load restrictions in place.
This data is for informational purposes only and should not be used for route clearance or vehicle weight decisions.