US Bridges

N3520 over Dry Creek

FairPosted for load

Lincoln County, Oklahoma · .2N 1.8E .6S of Davenport · Structure no. 219960000000000

Built
1988
37 years old
Condition
Fair
inspected March 2024
Type
Tee Beam
Concrete
Length
104 ft
3 main spans
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

N3520 over Dry Creek is a concrete tee beam carrying N3520 over Dry Creek in Lincoln County, Oklahoma. It was built in 1988, so it is 37 years old, younger 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 104 ft (31.7 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesN3520
CrossesDry Creek
Location.2N 1.8E .6S of Davenport
RouteCounty Highway N3520
Coordinates35.70055, -96.73372
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29 US tons
Inventory rating17 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length104 ft (31.7 m)
Longest span40 ft (12.2 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic160 by 2042
Trucks10%
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

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$519,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N3520 over Dry Creek built?

It was built in 1988, making it 37 years old in 2025.

What condition is N3520 over Dry 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 March 2024.

How much traffic does N3520 over Dry Creek carry?

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

How long is N3520 over Dry Creek?

The structure is 104 ft (31.7 m) long with a longest span of 40 ft (12.2 m) and a deck 28 ft wide.

Who owns N3520 over Dry Creek?

It is owned by the County Highway Agency.