US Bridges

T-604 Muddy Run RD over Muddy Run

Poor

Franklin County, Pennsylvania · 0.70 Mi. SW of SR 433 · Structure no. 000000000017729

Built
1963
62 years old
Condition
Poor
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
275
2009 count
Owner
County
County Highway Agency

About this bridge

T-604 Muddy Run RD over Muddy Run is a steel stringer/multi-beam or girder carrying T-604 Muddy Run RD over Muddy Run in Franklin County, Pennsylvania. It was built in 1963, so it is 62 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 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 275 vehicles a day, roughly 10% of them trucks, projected to reach 385 by 2029. The structure is 40 ft (12.2 m) long and 17 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesT-604 Muddy Run RD
CrossesMuddy Run
Location0.70 Mi. SW of SR 433
RouteCity Street 0
CountyFranklin County
StatePennsylvania
Coordinates40.04767, -77.61272
Functional classRural Local

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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating74 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span38 ft (11.6 m)
Deck width17 ft (5.3 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic275 (2009)
Projected traffic385 by 2029
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$116,000
NavigationNo navigation control on waterway

Frequently asked questions

When was T-604 Muddy Run RD over Muddy Run built?

It was built in 1963, making it 62 years old in 2025.

What condition is T-604 Muddy Run RD over Muddy Run 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 October 2023.

How much traffic does T-604 Muddy Run RD over Muddy Run carry?

About 275 vehicles per day (2009 count), of which roughly 10% are trucks.

How long is T-604 Muddy Run RD over Muddy Run?

The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.6 m) and a deck 17 ft wide.

Who owns T-604 Muddy Run RD over Muddy Run?

It is owned by the County Highway Agency.