US Bridges

Coll 7691 over N Br Big Blue River

FairPosted for load

Polk County, Nebraska · .5E 4.7S of Osceola · Structure no. C007203105

Built
1930
95 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
61 ft
3 main spans
Daily traffic
55
1998 count
Owner
County
County Highway Agency

About this bridge

Coll 7691 over N Br Big Blue River is a steel stringer/multi-beam or girder carrying Coll 7691 over N Br Big Blue River in Polk County, Nebraska. It was built in 1930, so it is 95 years old, older than the Nebraska average of 47.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 55 vehicles a day, projected to reach 93 by 2041. The structure is 61 ft (18.6 m) long and 20 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

Location

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CarriesColl 7691
CrossesN Br Big Blue River
Location.5E 4.7S of Osceola
RouteCounty Highway 7691
CountyPolk County
StateNebraska
Coordinates41.1115, -97.5405
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating27.6 US tons
Inventory rating16.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length61 ft (18.6 m)
Longest span34 ft (10.4 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic55 (1998)
Projected traffic93 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.1 mi (50 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Coll 7691 over N Br Big Blue River built?

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

What condition is Coll 7691 over N Br Big Blue River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in November 2023.

How much traffic does Coll 7691 over N Br Big Blue River carry?

About 55 vehicles per day (1998 count).

How long is Coll 7691 over N Br Big Blue River?

The structure is 61 ft (18.6 m) long with a longest span of 34 ft (10.4 m) and a deck 20 ft wide.

Who owns Coll 7691 over N Br Big Blue River?

It is owned by the County Highway Agency.