US Bridges

N3730 over Mosquito Creek

FairPosted for load

Creek County, Oklahoma · 1E 3.3S of SH48/SH33 · Structure no. 045400000000000

Built
1935
90 years old
Condition
Fair
inspected June 2024
Type
Girder and Floorbeam System
Steel
Length
90 ft
4 main spans
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

N3730 over Mosquito Creek is a steel girder and floorbeam system carrying N3730 over Mosquito Creek in Creek County, Oklahoma. It was built in 1935, so it is 90 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. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, roughly 10% of them trucks, projected to reach 160 by 2042. The structure is 90 ft (27.5 m) long and 16 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesN3730
CrossesMosquito Creek
Location1E 3.3S of SH48/SH33
RouteCounty Highway N3730
CountyCreek County
StateOklahoma
Coordinates35.95527, -96.36814
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating16.8 US tons
Inventory rating10.1 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckWood or timber
Main spans4
Design loadUnknown
Structure length90 ft (27.5 m)
Longest span36 ft (11 m)
Deck width16 ft (5 m)
Roadway width14 ft (4.4 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 closed3.7 mi (6 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$238,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N3730 over Mosquito Creek built?

It was built in 1935, making it 90 years old in 2025.

What condition is N3730 over Mosquito 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 June 2024.

How much traffic does N3730 over Mosquito Creek carry?

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

How long is N3730 over Mosquito Creek?

The structure is 90 ft (27.5 m) long with a longest span of 36 ft (11 m) and a deck 16 ft wide.

Who owns N3730 over Mosquito Creek?

It is owned by the County Highway Agency.