SR1139 over Dog Branch Creek
Alleghany County, North Carolina · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR1139 over Dog Branch Creek in Alleghany County, North Carolina, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 2017, making it 8 years old at the 2025 inventory.
- It carries about 100 vehicles a day (traffic count year 2000).
- Its listed owner is the state highway agency.
- It is one of 51 of the 117 inventoried bridges in Alleghany County rated good (43.6%); 17 (14.5%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated October 2023, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (36.47504, -81.16392)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 24 ft |
| Location | .1 MI.W.JCT.SR1135 |
| NBI structure number | 000000000050044 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | U: unknown foundation, not evaluated for scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the North Carolina department of transportation.
Busiest bridges in Alleghany County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US21 over Little River | 1920 | 7,200 | Fair |
| US21 over Brush Creek | 1997 | 3,700 | Good |
| US21 over Glade Creek | 2016 | 3,700 | Good |
| US21 over Laurel Branch | 2016 | 3,300 | Good |
| SR1206 over Bledsoe Creek | 1997 | 3,100 | Good |
| SR1206 over Bledsoe Creek | 1997 | 3,100 | Good |
All bridges nearby: Alleghany County, NC bridge conditions · every bridge in Alleghany County · North Carolina bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.