US Bridges

SR1605 over Williamson Swamp

FairPosted for load

Sampson County, North Carolina · 0.1 MI E SR1602 · Structure no. 000000001630271

Built
1969
56 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
36 ft
2 main spans
Daily traffic
550
2021 count
Owner
State
State Highway Agency

About this bridge

SR1605 over Williamson Swamp is a wood or timber stringer/multi-beam or girder carrying SR1605 over Williamson Swamp in Sampson County, North Carolina. It was built in 1969, so it is 56 years old, older than the North Carolina average of 38.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 550 vehicles a day, roughly 6% of them trucks, projected to reach 1,100 by 2040. The structure is 36 ft (10.9 m) long and 25 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR1605
CrossesWilliamson Swamp
Location0.1 MI E SR1602
RouteState Highway 1605
CountySampson County
StateNorth Carolina
Coordinates35.20039, -78.5948
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.9 US tons
Inventory rating17 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length36 ft (10.9 m)
Longest span17 ft (5.1 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic550 (2021)
Projected traffic1,100 by 2040
Trucks6%
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR1605 over Williamson Swamp built?

It was built in 1969, making it 56 years old in 2025.

What condition is SR1605 over Williamson Swamp in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2024.

How much traffic does SR1605 over Williamson Swamp carry?

About 550 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is SR1605 over Williamson Swamp?

The structure is 36 ft (10.9 m) long with a longest span of 17 ft (5.1 m) and a deck 25 ft wide.

Who owns SR1605 over Williamson Swamp?

It is owned by the State Highway Agency.