US Bridges

N3020 over Boggy Creek

PoorPosted for load

Logan County, Oklahoma · 2W 1.8S of SH74/SH33 · Structure no. 217910000000000

Built
1988
37 years old
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
35 ft
1 main span
Daily traffic
24
2022 count
Owner
County
County Highway Agency

About this bridge

N3020 over Boggy Creek is a steel stringer/multi-beam or girder carrying N3020 over Boggy Creek in Logan 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 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 20 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesN3020
CrossesBoggy Creek
Location2W 1.8S of SH74/SH33
RouteCounty Highway N3020
Coordinates35.84603, -97.62082
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating11 US tons
Inventory rating8 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadH 10
Structure length35 ft (10.7 m)
Longest span34 ft (10.4 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24 (2022)
Projected traffic38 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$290,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N3020 over Boggy Creek built?

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

What condition is N3020 over Boggy 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 July 2024.

How much traffic does N3020 over Boggy Creek carry?

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

How long is N3020 over Boggy Creek?

The structure is 35 ft (10.7 m) long with a longest span of 34 ft (10.4 m) and a deck 20 ft wide.

Who owns N3020 over Boggy Creek?

It is owned by the County Highway Agency.