US Bridges

N3620 over Gar Creek

Fair

Seminole County, Oklahoma · 1.8 S of Sylvian · Structure no. 186970000000000

Built
1974
51 years old, rebuilt 1984
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
61 ft
3 main spans
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

N3620 over Gar Creek is a steel stringer/multi-beam or girder carrying N3620 over Gar Creek in Seminole County, Oklahoma. It was built in 1974 and reconstructed in 1984, so it is 51 years old, older than the Oklahoma average of 47.8 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.

It carries about 100 vehicles a day, roughly 10% of them trucks, projected to reach 160 by 2042. The structure is 61 ft (18.5 m) long and 16 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesN3620
CrossesGar Creek
Location1.8 S of Sylvian
RouteCounty Highway N3620
CountySeminole County
StateOklahoma
Coordinates35.32273, -96.56426
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating77.1 US tons
Inventory rating46 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length61 ft (18.5 m)
Longest span24 ft (7.4 m)
Deck width16 ft (4.8 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic160 by 2042
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$225,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N3620 over Gar Creek built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 1984.

What condition is N3620 over Gar Creek 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 August 2023.

How much traffic does N3620 over Gar Creek carry?

About 100 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is N3620 over Gar Creek?

The structure is 61 ft (18.5 m) long with a longest span of 24 ft (7.4 m) and a deck 16 ft wide.

Who owns N3620 over Gar Creek?

It is owned by the County Highway Agency.