US Bridges

N4100 over Opossum Creek

PoorPosted for load

Nowata County, Oklahoma · 3.0 MI W of 169 · Structure no. 026600000000000

Built
1930
95 years old
Condition
Poor
inspected May 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
35 ft
1 main span
Daily traffic
24
2022 count
Owner
County
County Highway Agency

About this bridge

N4100 over Opossum Creek is a concrete stringer/multi-beam or girder carrying N4100 over Opossum Creek in Nowata 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 24 vehicles a day, roughly 10% of them trucks, projected to reach 38 by 2042. The structure is 35 ft (10.7 m) long and 18 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesN4100
CrossesOpossum Creek
Location3.0 MI W of 169
RouteCounty Highway N4100
Coordinates36.97034, -95.67848
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating35.3 US tons
Inventory rating21.2 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length35 ft (10.7 m)
Longest span31 ft (9.4 m)
Deck width18 ft (5.5 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24 (2022)
Projected traffic38 by 2042
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$290,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N4100 over Opossum Creek built?

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

What condition is N4100 over Opossum 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 May 2024.

How much traffic does N4100 over Opossum Creek carry?

About 24 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is N4100 over Opossum Creek?

The structure is 35 ft (10.7 m) long with a longest span of 31 ft (9.4 m) and a deck 18 ft wide.

Who owns N4100 over Opossum Creek?

It is owned by the County Highway Agency.