US Bridges

FAU 8421 (n Mingo over Douglas Creek

Poor

Tulsa County, Oklahoma · 1800 N. Mingo Rd. · Structure no. 133370000000000

Built
1955
70 years old
Condition
Poor
inspected November 2024
Type
Culvert
Concrete
Length
32 ft
3 main spans
Daily traffic
8,579
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

FAU 8421 (n Mingo over Douglas Creek is a concrete culvert carrying FAU 8421 (n Mingo over Douglas Creek in Tulsa County, Oklahoma. It was built in 1955, so it is 70 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 3 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.

It carries about 8,579 vehicles a day, roughly 5% of them trucks, projected to reach 13,726 by 2042. The structure is 32 ft (9.8 m) long and 69 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesFAU 8421 (n Mingo
CrossesDouglas Creek
Location1800 N. Mingo Rd.
RouteCity Street 8421
CountyTulsa County
StateOklahoma
Coordinates36.18172, -95.86884
Functional classUrban Collector

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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span10 ft (3 m)
Deck width69 ft (21 m)
Roadway width55 ft (16.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,579 (2022)
Projected traffic13,726 by 2042
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$225,000
NavigationNo navigation control on waterway

Frequently asked questions

When was FAU 8421 (n Mingo over Douglas Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is FAU 8421 (n Mingo over Douglas 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 November 2024.

How much traffic does FAU 8421 (n Mingo over Douglas Creek carry?

About 8,579 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is FAU 8421 (n Mingo over Douglas Creek?

The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m) and a deck 69 ft wide.

Who owns FAU 8421 (n Mingo over Douglas Creek?

It is owned by the City or Municipal Highway Agency.