STATE ROUTE 49

over AMADOR CREEK

10-AMA-049-R10.56, Amador County, California

Condition

Good

Year Built

2007

Daily Traffic

13,900

Length

62 ft

About This Bridge

STATE ROUTE 49 carries traffic over AMADOR CREEK in Amador County, California. Built in 2007, this structure is 19 years old, representing modern engineering and construction standards. 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 13,900 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 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 62 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

7

Deck Condition

Good

7

Superstructure

Good

7

Substructure

Good

9

Channel & Protection

Excellent

7

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 2007, maintaining good condition demonstrates effective maintenance practices.

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 State Highway Agency.

Construction

Year Built2007
MaterialPrestressed Concrete Continuous
Design TypeBox Beam - Multiple
OwnerState Highway Agency

Dimensions

Total Length62 ft (18.9 m)
Max Span18 ft (5.4 m)
Deck Width4 ft
Deck Area2,438 sq ft

Span dimensions affect structural design choices and load distribution. The deck area of 2,438 sq ft determines surface maintenance scope.

Classification

Route TypeState Highway
Route Number49
Lanes On Bridge2
Lanes Under Bridge

Status

Toll BridgeNo
Historical SignificanceNot eligible
Scour Critical8
Detour Length1 mi (1 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.

13,900

Avg Daily Traffic (2009)

Vehicles per day crossing this bridge

Truck Traffic

Commercial vehicle percentage

8,430

Projected Future ADT

Estimated future demand

This bridge carries approximately 13,900 vehicles per day, translating to roughly 5,073,500 crossings annually. This moderate traffic level is typical for regional connectors.

Traffic projections estimate future volumes of 8,430 vehicles daily, a decrease 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

3.2 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 3.2 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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38.467222, -121.563889

Identification

Structure Number26 0043
NBI IDCA-26 0043
State FIPS06
County FIPS005

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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.

STATE ROUTE 49 over AMADOR CREEK | California