Trunk Road over Trunk Road Overhead
Matanuska-Susitna Borough, Alaska · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Trunk Road over Trunk Road Overhead in Matanuska-Susitna Borough, Alaska, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, 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 200 vehicles a day (traffic count year 2018).
- Its listed owner is the county highway agency.
- It is one of 60 of the 121 inventoried bridges in Matanuska-Susitna Borough rated good (49.6%); 8 (6.6%) are rated poor.
- 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 → (61.55158, -149.2815)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 8 | Very good condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete tee beam |
| Length | about 165 ft |
| Location | Mile Point 0.2 |
| NBI structure number | 2307 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Alaska department of transportation.
Busiest bridges in Matanuska-Susitna Borough
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Parks Highway over Seward Meridian U.c. | 2005 | 32,100 | Good |
| Glenn Highway over Knik River Access U.c. | 1993 | 26,600 | Good |
| Palmer-wasill Ext over Cottonwood Overhead | 2002 | 14,000 | Fair |
| Glenn Highway over Matanuska Riv Northbound | 1965 | 13,300 | Fair |
| Glenn Highway over Knik Riv. Overflow S.B. | 1993 | 13,300 | Fair |
| Glenn Highway over Knik Riv. Overflow N.B. | 1993 | 13,300 | Fair |
All bridges nearby: Matanuska-Susitna Borough, AK bridge conditions · every bridge in Matanuska-Susitna Borough · Alaska bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.