Pa Tpk (I-476) over Br. Towamencin Crk
Montgomery County, Pennsylvania · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Pa Tpk (I-476) over Br. Towamencin Crk in Montgomery County, Pennsylvania, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1955, making it 70 years old at the 2025 inventory.
- It carries about 65,329 vehicles a day (traffic count year 2004).
- It is one of 469 of the 830 inventoried bridges in Montgomery County rated fair (56.5%); 96 (11.6%) 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 August 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 → (40.23535, -75.33849)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 23 ft |
| Location | Near Lansdale |
| NBI structure number | 000000000028255 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 4: foundations stable, field review says exposed foundations need protection |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Pennsylvania department of transportation.
Busiest bridges in Montgomery County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| County Line Expway over Schuylkill River & Nsrc | 2018 | 150,726 | Good |
| County Line Expwy over South Trooper Road | 2019 | 150,726 | Good |
| County Line Expway over Schuylkill River Trail | 2019 | 150,726 | Good |
| Pa Tpk (I-276) over Wissahickon CR Db-135w | 1954 | 120,317 | Fair |
| Pa Tpk (I-276) over Pennypack CR. | 1954 | 104,500 | Good |
| Pa Tpk (I-276) over Br Pennypack CR. | 1954 | 104,500 | Fair |
All bridges nearby: Montgomery County, PA bridge conditions · every bridge in Montgomery County · Pennsylvania bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.