US Bridges

N3944 over Flat Rock Creek

PoorPosted for load

Okmulgee County, Oklahoma · 1.S of Preston · Structure no. 029820000000000

Built
1930
95 years old
Condition
Poor
inspected September 2024
Type
Truss - Thru
Steel
Length
53 ft
1 main span
Daily traffic
450
2022 count
Owner
County
County Highway Agency

About this bridge

N3944 over Flat Rock Creek is a steel truss - thru carrying N3944 over Flat Rock Creek in Okmulgee County, Oklahoma. It was built in 1930, so it is 95 years old, older than the Oklahoma average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 450 vehicles a day, roughly 10% of them trucks, projected to reach 720 by 2042. The structure is 53 ft (16.2 m) long and 18 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesN3944
CrossesFlat Rock Creek
Location1.S of Preston
RouteCounty Highway N3944
Coordinates35.69911, -95.99011
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating21.4 US tons
Inventory rating5.1 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 10
Structure length53 ft (16.2 m)
Longest span50 ft (15.2 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic450 (2022)
Projected traffic720 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-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$354,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N3944 over Flat Rock Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is N3944 over Flat Rock Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does N3944 over Flat Rock Creek carry?

About 450 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is N3944 over Flat Rock Creek?

The structure is 53 ft (16.2 m) long with a longest span of 50 ft (15.2 m) and a deck 18 ft wide.

Who owns N3944 over Flat Rock Creek?

It is owned by the County Highway Agency.