US 77/83 E-N CONN

over US 77 BU 83 WB & SP 54

US 77/83 INTERCHANGE, Cameron County, Texas

Condition

Fair

Year Built

2002

Daily Traffic

5,600

Length

357 ft

About This Bridge

US 77/83 E-N CONN carries traffic over US 77 BU 83 WB & SP 54 in Cameron County, Texas. Built in 2002, this structure is 24 years old, representing modern engineering and construction standards. 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 5,600 vehicles cross this bridge daily, indicating lower traffic volumes common for local roads and rural routes. While traffic is lighter, these bridges still serve essential community transportation needs.

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 357 feet, this structure falls within the typical range requiring standard inspection procedures conducted by certified bridge inspectors.

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

7

Deck Condition

Good

6

Superstructure

Satisfactory

6

Substructure

Satisfactory

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 2002, this condition level is expected given the bridge's age and usage patterns.

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

Year Built2002
MaterialSteel Continuous
Design TypeStringer/Multi-beam or Girder
OwnerState Highway Agency

Dimensions

Total Length357 ft (108.9 m)
Max Span23 ft (7.0 m)
Deck Width3 ft
Deck Area10,020 sq ft

Span dimensions affect structural design choices and load distribution. The deck area of 10,020 sq ft determines surface maintenance scope.

Classification

Route TypeUS Highway
Route Number77
Lanes On Bridge1
Lanes Under Bridge27

Status

Toll BridgeNo
Historical SignificanceNot eligible
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.

5,600

Avg Daily Traffic (2011)

Vehicles per day crossing this bridge

Truck Traffic

Commercial vehicle percentage

6,100

Projected Future ADT

Estimated future demand

This bridge carries approximately 5,600 vehicles per day, translating to roughly 2,044,000 crossings annually. Lower traffic volumes generally result in less structural wear over time.

Traffic projections estimate future volumes of 6,100 vehicles daily, a 9% 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

5.4 tons

Maximum allowable load for special permits

Inventory Rating

3.3 tons

Load level for normal traffic

The operating rating of 5.4 tons represents the absolute maximum load this bridge can carry under controlled conditions with special permits. The inventory rating of 3.3 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

Stable

Condition has remained relatively stable since 2020

Data: 2020-2024 FHWA National Bridge Inventory

Location

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26.661944, -98.280278

Identification

Structure Number210310003919291
NBI IDTX-210310003919291
State FIPS48
County FIPS061

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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.

US 77/83 E-N CONN over US 77 BU 83 WB & SP 54 | Texas