US Bridges

N3705 (treaty Rd) over Island Bayou Creek

Good

Bryan County, Oklahoma · 2S 2E of Olive · Structure no. 313750000000000

Built
2019
6 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
165 ft
3 main spans
Daily traffic
74
2022 count
Owner
County
County Highway Agency

About this bridge

N3705 (treaty Rd) over Island Bayou Creek is a steel stringer/multi-beam or girder carrying N3705 (treaty Rd) over Island Bayou Creek in Bryan County, Oklahoma. It was built in 2019, so it is 6 years old, younger than the Oklahoma average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 74 vehicles a day, roughly 10% of them trucks, projected to reach 118 by 2042. The structure is 165 ft (50.3 m) long and 28 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesN3705 (treaty Rd)
CrossesIsland Bayou Creek
Location2S 2E of Olive
RouteCounty Highway N3705
Coordinates33.88311, -96.41536
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating63.1 US tons
Inventory rating38 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length165 ft (50.3 m)
Longest span55 ft (16.8 m)
Deck width28 ft (8.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic74 (2022)
Projected traffic118 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was N3705 (treaty Rd) over Island Bayou Creek built?

It was built in 2019, making it 6 years old in 2025.

What condition is N3705 (treaty Rd) over Island Bayou Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does N3705 (treaty Rd) over Island Bayou Creek carry?

About 74 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is N3705 (treaty Rd) over Island Bayou Creek?

The structure is 165 ft (50.3 m) long with a longest span of 55 ft (16.8 m) and a deck 28 ft wide.

Who owns N3705 (treaty Rd) over Island Bayou Creek?

It is owned by the County Highway Agency.