HWY RAMP E-T

over HWY RAMP 1A A/D

1.20 KM SE OF CALLAHAN TU, Suffolk County, Massachusetts

Condition

Fair

Year Built

1996

Daily Traffic

13,360

Length

51 ft

About This Bridge

HWY RAMP E-T carries traffic over HWY RAMP 1A A/D in Suffolk County, Massachusetts. Built in 1996, this structure is 30 years old, built during a period of significant highway expansion. The bridge features prestressed concrete continuous construction with a box beam - multiple design, a combination chosen by engineers to meet the specific requirements of this crossing.

Approximately 13,360 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.

The bridge is currently rated in fair 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 51 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

6

Deck Condition

Satisfactory

6

Superstructure

Satisfactory

7

Substructure

Good

Channel & Protection

N/A

6

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.

The fair condition rating of 6 indicates satisfactory condition with minor section loss or deterioration.

For a structure built in 1996, this condition level is expected given the bridge's age and usage patterns.

Bridge Details

Prestressed Concrete Continuous is the primary structural material, which influences maintenance requirements and expected lifespan. The box beam - multiple design was selected based on span requirements, load capacity needs, and site conditions at the time of construction. Maintenance responsibility falls to Other State.

Construction

Year Built1996
MaterialPrestressed Concrete Continuous
Design TypeBox Beam - Multiple
OwnerOther State

Dimensions

Total Length51 ft (15.6 m)
Max Span15 ft (4.6 m)
Deck Width6 ft
Deck Area2,952 sq ft

Span dimensions affect structural design choices and load distribution. The deck area of 2,952 sq ft determines surface maintenance scope.

Classification

Route TypeOther
Route Number0
Lanes On Bridge3
Lanes Under Bridge7

Status

Toll BridgeYes
Historical SignificanceNot determined
Scour CriticalN
Detour Length1 mi (2 km)

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.

13,360

Avg Daily Traffic (2001)

Vehicles per day crossing this bridge

Truck Traffic

Commercial vehicle percentage

Projected Future ADT

Estimated future demand

This bridge carries approximately 13,360 vehicles per day, translating to roughly 4,876,400 crossings annually. This moderate traffic level is typical for regional connectors.

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

6.8 tons

Maximum allowable load for special permits

Inventory Rating

4.0 tons

Load level for normal traffic

The operating rating of 6.8 tons represents the absolute maximum load this bridge can carry under controlled conditions with special permits. The inventory rating of 4.0 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

Declining

Condition has declined by 1.0 rating points since 2020

Data: 2020-2024 FHWA National Bridge Inventory

Location

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42.644444, -72.127778

Identification

Structure NumberB16562A87MPANBI
NBI IDMA-B16562A87MPANBI
State FIPS25
County FIPS025

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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.

HWY RAMP E-T over HWY RAMP 1A A/D | Massachusetts