Service Road over Alley Spring Branch
Shannon County, Missouri · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Service Road over Alley Spring Branch in Shannon County, Missouri, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1975 and reconstructed in 1983, making it 50 years old at the 2025 inventory.
- It carries about 10 vehicles a day (traffic count year 2019).
- It is one of 40 of the 64 inventoried bridges in Shannon County rated fair (62.5%); 7 (10.9%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated April 2024, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (37.15072, -91.44131)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 90 ft |
| Location | Adjacent to Alley Spring |
| NBI structure number | 6640005P0000000 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | April 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Missouri department of transportation.
Busiest bridges in Shannon County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 60 E over Birch CR | 1967 | 6,107 | Fair |
| US 60 E over Hurricane CR | 1967 | 5,568 | Fair |
| US 60 E over Seamam CR | 1967 | 4,202 | Fair |
| US 60 E over Deep Pond Hollow | 1978 | 4,202 | Fair |
| US 60 W over Jam UP CR | 2008 | 3,807 | Good |
| US 60 E over Jam UP CR | 2011 | 3,617 | Good |
All bridges nearby: Shannon County, MO bridge conditions · every bridge in Shannon County · Missouri bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.