US Bridges

Coll 7686 over N Br Big Blue River

Good

Polk County, Nebraska · 3.5E of Stromsburg · Structure no. C007203815

Built
1984
41 years old
Condition
Good
inspected November 2023
Type
Slab
Concrete Continuous
Length
117 ft
3 main spans
Daily traffic
45
1998 count
Owner
County
County Highway Agency

About this bridge

Coll 7686 over N Br Big Blue River is a concrete continuous slab carrying Coll 7686 over N Br Big Blue River in Polk County, Nebraska. It was built in 1984, so it is 41 years old, younger than the Nebraska average of 47.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 45 vehicles a day, projected to reach 76 by 2041. The structure is 117 ft (35.7 m) long and 30 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

CarriesColl 7686
CrossesN Br Big Blue River
Location3.5E of Stromsburg
RouteCounty Highway 7686
Coordinates41.1195, -97.532
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.4 US tons
Inventory rating35.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length117 ft (35.7 m)
Longest span46 ft (14 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (1998)
Projected traffic76 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 7686 over N Br Big Blue River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Coll 7686 over N Br Big Blue River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does Coll 7686 over N Br Big Blue River carry?

About 45 vehicles per day (1998 count).

How long is Coll 7686 over N Br Big Blue River?

The structure is 117 ft (35.7 m) long with a longest span of 46 ft (14 m) and a deck 30 ft wide.

Who owns Coll 7686 over N Br Big Blue River?

It is owned by the County Highway Agency.