MONROE STREET

over SPOKANE RIVER

00.60 N OF I-90, Spokane County, Washington

Condition

Good

Year Built

1911

Daily Traffic

18,453

Length

89 ft

About This Bridge

MONROE STREET carries traffic over SPOKANE RIVER in Spokane County, Washington. Built in 1911, this structure is 115 years old, making it a historic structure that has served the community for generations. The bridge features concrete continuous construction with a arch - deck design, a combination chosen by engineers to meet the specific requirements of this crossing.

Approximately 18,453 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 2% 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 89 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

8

Deck Condition

Very Good

8

Superstructure

Very Good

8

Substructure

Very Good

8

Channel & Protection

Very Good

8

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 8, this bridge demonstrates very good condition with only minor issues.

For a structure built in 1911, maintaining good condition demonstrates effective maintenance practices.

Bridge Details

Concrete Continuous is the primary structural material, which influences maintenance requirements and expected lifespan. The arch - deck design was selected based on span requirements, load capacity needs, and site conditions at the time of construction. Maintenance responsibility falls to City/Municipal.

Construction

Year Built1911
Year Reconstructed2005
MaterialConcrete Continuous
Design TypeArch - Deck
OwnerCity/Municipal

Dimensions

Total Length89 ft (27.2 m)
Max Span28 ft (8.6 m)
Deck Width7 ft
Deck Area5,880 sq ft

Span dimensions affect structural design choices and load distribution. The deck area of 5,880 sq ft determines surface maintenance scope.

Classification

Route TypeCity Street
Route Number815
Lanes On Bridge4
Lanes Under Bridge

Status

Toll BridgeNo
Historical SignificanceOn National Register of Historic Places
Scour Critical8
Detour Length2 mi (3 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.

18,453

Avg Daily Traffic (2022)

Vehicles per day crossing this bridge

2%

Truck Traffic

Commercial vehicle percentage

40,000

Projected Future ADT

Estimated future demand

This bridge carries approximately 18,453 vehicles per day, translating to roughly 6,735,345 crossings annually. This moderate traffic level is typical for regional connectors.

Commercial trucks comprise 2% 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 40,000 vehicles daily, a 117% 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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48.730000, -118.407500

Identification

Structure Number085295000000000
NBI IDWA-085295000000000
State FIPS53
County FIPS063

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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.

MONROE STREET over SPOKANE RIVER, Washington — Bridge Condition | BridgeReport.org | BridgeReport.org