SR 127

over SNAKE R CENTRAL FERRY

9.6 N JCT US 12, Garfield County, Washington

Condition

Poor

Year Built

1969

Daily Traffic

845

Length

183 ft

About This Bridge

SR 127 carries traffic over SNAKE R CENTRAL FERRY in Garfield County, Washington. Built in 1969, this structure is 57 years old, placing it among the older bridges still in active service. The bridge features steel continuous construction with a arch - thru design, a combination chosen by engineers to meet the specific requirements of this crossing.

Approximately 845 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. Commercial trucks account for 31% of all crossings. This heavy commercial usage significantly impacts structural wear, as a single fully-loaded truck can cause as much deck wear as thousands of passenger vehicles. Transportation planners factor this into maintenance scheduling and budget allocation.

The bridge is currently rated in poor condition based on federal inspection criteria established by the Federal Highway Administration. It is classified as structurally deficient, meaning one or more components have received a rating of 4 or below on the 0-9 scale. This designation indicates significant deterioration that warrants attention, though the bridge remains safe for travel within its posted limits. Structurally deficient does not mean unsafe—rather, it signals that repairs or replacement should be prioritized in transportation planning. With a total length of 183 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

Structurally Deficient

This bridge has one or more component ratings of 4 or below, indicating significant deterioration that requires attention. The bridge remains safe for travel but may have load restrictions.

3

Deck Condition

Serious

6

Superstructure

Satisfactory

7

Substructure

Good

8

Channel & Protection

Very Good

3

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 deck rating of 3 indicates serious deterioration with section loss or spalling.

For a structure built in 1969, the current condition reflects the cumulative effects of age, traffic, and environmental exposure. If this bridge were closed, traffic would face a detour of approximately 43 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 arch - thru 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 Built1969
MaterialSteel Continuous
Design TypeArch - Thru
OwnerState Highway Agency

Dimensions

Total Length183 ft (55.8 m)
Max Span52 ft (15.8 m)
Deck Width3 ft
Deck Area5,804 sq ft

Span dimensions affect structural design choices and load distribution. The deck area of 5,804 sq ft determines surface maintenance scope.

Classification

Route TypeState Highway
Route Number127
Lanes On Bridge2
Lanes Under Bridge

Status

Toll BridgeNo
Historical SignificancePossibly eligible
Scour Critical8
Detour Length43 mi (69 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.

845

Avg Daily Traffic (2022)

Vehicles per day crossing this bridge

31%

Truck Traffic

Commercial vehicle percentage

855

Projected Future ADT

Estimated future demand

This bridge carries approximately 845 vehicles per day, translating to roughly 308,425 crossings annually. Lower traffic volumes generally result in less structural wear over time.

Commercial trucks comprise 31% 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. This high percentage of truck traffic may accelerate deterioration of deck surfaces and structural components.

Traffic projections estimate future volumes of 855 vehicles daily, a 1% 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

8.2 tons

Maximum allowable load for special permits

Inventory Rating

4.9 tons

Load level for normal traffic

The operating rating of 8.2 tons represents the absolute maximum load this bridge can carry under controlled conditions with special permits. The inventory rating of 4.9 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

Loading map...

47.352778, -119.102778

Identification

Structure Number0008494A0000000
NBI IDWA-0008494A0000000
State FIPS53
County FIPS023

Explore More

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.

SR 127 over SNAKE R CENTRAL FERRY | Washington