US Bridges

Pa 117; Mt.Wilson over Conewago Creek

Poor

Lebanon County, Pennsylvania · Colebrook · Structure no. 000000000022660

Built
1974
51 years old
Condition
Poor
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
36 ft
1 main span
Daily traffic
4,350
2024 count
Owner
State
State Highway Agency

About this bridge

Pa 117; Mt.Wilson over Conewago Creek is a prestressed concrete box beam or girders - multiple carrying Pa 117; Mt.Wilson over Conewago Creek in Lebanon County, Pennsylvania. It was built in 1974, so it is 51 years old, younger 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 4 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.

It carries about 4,350 vehicles a day, roughly 7% of them trucks, projected to reach 4,570 by 2032. The structure is 36 ft (11 m) long and 49 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesPa 117; Mt.Wilson
CrossesConewago Creek
LocationColebrook
RouteState Highway 117
Coordinates40.24064, -76.51248
Functional classRural Major Collector

Condition and inspection

Poor

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.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating13 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length36 ft (11 m)
Longest span32 ft (9.8 m)
Deck width49 ft (14.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,350 (2024)
Projected traffic4,570 by 2032
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$81,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Pa 117; Mt.Wilson over Conewago Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is Pa 117; Mt.Wilson over Conewago 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 July 2023.

How much traffic does Pa 117; Mt.Wilson over Conewago Creek carry?

About 4,350 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is Pa 117; Mt.Wilson over Conewago Creek?

The structure is 36 ft (11 m) long with a longest span of 32 ft (9.8 m) and a deck 49 ft wide.

Who owns Pa 117; Mt.Wilson over Conewago Creek?

It is owned by the State Highway Agency.