LOCAL
over BR DES MOINES RIVER
075181007, Marion County, Iowa
Condition
PoorYear Built
1878
Daily Traffic
21
Length
60 ft
About This Bridge
LOCAL carries traffic over BR DES MOINES RIVER in Marion County, Iowa. Built in 1878, this structure is 148 years old, making it a historic structure that has served the community for generations. The bridge features steel construction with a truss - thru design, a combination chosen by engineers to meet the specific requirements of this crossing.
Approximately 21 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 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 60 feet, this is a shorter span typical of local road crossings, often carrying traffic over small streams, drainage channels, or other roadways.
Steel bridges provide high strength-to-weight ratios, making them suitable for longer spans. However, they require ongoing protection against corrosion through painting or weathering steel designs. Inspectors pay close attention to connection points, fatigue cracking, and coating condition.
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.
Deck Condition
Poor
Superstructure
Poor
Substructure
Serious
Channel & Protection
Satisfactory
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 4 indicates advanced deterioration affecting the driving surface. The superstructure rating of 4 shows advanced deterioration in beams or girders. The substructure rating of 3 reflects serious deterioration in supports.
For a structure built in 1878, 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 99 miles, underscoring the importance of maintaining this crossing.
Bridge Details
Steel is the primary structural material, which influences maintenance requirements and expected lifespan. The truss - thru design was selected based on span requirements, load capacity needs, and site conditions at the time of construction. Maintenance responsibility falls to County Highway Agency.
Construction
Dimensions
Span dimensions affect structural design choices and load distribution. The deck area of 787 sq ft determines surface maintenance scope.
Classification
Status
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.
21
Avg Daily Traffic (2022)
Vehicles per day crossing this bridge
—
Truck Traffic
Commercial vehicle percentage
21
Projected Future ADT
Estimated future demand
This bridge carries approximately 21 vehicles per day, translating to roughly 7,665 crossings annually. Lower traffic volumes generally result in less structural wear over time.
Traffic projections estimate future volumes of 21 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
1.8 tons
Maximum allowable load for special permits
Inventory Rating
1.4 tons
Load level for normal traffic
The operating rating of 1.8 tons represents the absolute maximum load this bridge can carry under controlled conditions with special permits. The inventory rating of 1.4 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
↓DecliningCondition has declined by 1.0 rating points since 2020
Data: 2020-2024 FHWA National Bridge Inventory
Location
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41.337222, -94.081667
Identification
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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.