US Bridges

E1720 over Eight Mile Creek

PoorPosted for load

Garvin County, Oklahoma · 1W .8N of Hennepen · Structure no. 275730000000000

Built
2003
22 years old
Condition
Poor
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
44 ft
1 main span
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

E1720 over Eight Mile Creek is a steel stringer/multi-beam or girder carrying E1720 over Eight Mile Creek in Garvin County, Oklahoma. It was built in 2003, so it is 22 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 160 by 2042. The structure is 44 ft (13.4 m) long and 19 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesE1720
CrossesEight Mile Creek
Location1W .8N of Hennepen
RouteCounty Highway E1720
Coordinates34.52133, -97.3671
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 protection7 GoodSome minor problems.
Last inspectionApril 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating14 US tons
Inventory rating8.4 US tons

Structure

MaterialSteel
DeckSteel plate
Main spans1
Design loadH 10
Structure length44 ft (13.4 m)
Longest span43 ft (13.1 m)
Deck width19 ft (5.9 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic160 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$274,000
NavigationNo navigation control on waterway

Frequently asked questions

When was E1720 over Eight Mile Creek built?

It was built in 2003, making it 22 years old in 2025.

What condition is E1720 over Eight Mile 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 April 2024.

How much traffic does E1720 over Eight Mile Creek carry?

About 100 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is E1720 over Eight Mile Creek?

The structure is 44 ft (13.4 m) long with a longest span of 43 ft (13.1 m) and a deck 19 ft wide.

Who owns E1720 over Eight Mile Creek?

It is owned by the County Highway Agency.