Deibler Gap T-474 over Mahantango Creek
PoorClosed to trafficDauphin County, Pennsylvania · Seaman Bridge · Structure no. 000000000014693
- Built
- 1900
- 125 years old
- Condition
- Poor
- inspected August 2023
- Type
- Truss - Thru
- Steel
- Length
- 168 ft
- 1 main span
- Daily traffic
- —
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Deibler Gap T-474 over Mahantango Creek is a steel truss - thru carrying Deibler Gap T-474 over Mahantango Creek in Dauphin County, Pennsylvania. It was built in 1900, so it is 125 years old, older than the Pennsylvania average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 1 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: closed to all traffic.
No traffic count is recorded. The structure is 168 ft (51.2 m) long and 16 ft wide. If it were closed, the detour would be 1.9 mi (3 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 1 Imminent Failure | Major deterioration or section loss present in critical structural components. Bridge is closed to traffic but corrective action may put it back in light service. |
| Superstructure | 1 Imminent Failure | Major deterioration or section loss present in critical structural components. Bridge is closed to traffic but corrective action may put it back in light service. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Deibler Gap T-474 over Mahantango Creek built?
It was built in 1900, making it 125 years old in 2025.
What condition is Deibler Gap T-474 over Mahantango Creek in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.
How much traffic does Deibler Gap T-474 over Mahantango Creek carry?
No traffic count is recorded for this structure.
How long is Deibler Gap T-474 over Mahantango Creek?
The structure is 168 ft (51.2 m) long with a longest span of 162 ft (49.4 m) and a deck 16 ft wide.
Who owns Deibler Gap T-474 over Mahantango Creek?
It is owned by the County Highway Agency.