US Bridges

N91 over Mud Creek

Good

Boone County, Nebraska · 4E Spalding · Structure no. S091 11033

Built
1990
35 years old
Condition
Good
inspected May 2023
Type
Slab
Concrete Continuous
Length
82 ft
3 main spans
Daily traffic
1,215
2018 count
Owner
State
State Highway Agency

About this bridge

N91 over Mud Creek is a concrete continuous slab carrying N91 over Mud Creek in Boone County, Nebraska. It was built in 1990, so it is 35 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,215 vehicles a day, roughly 14% of them trucks, projected to reach 1,762 by 2038. The structure is 82 ft (25 m) long and 39 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

CarriesN91
CrossesMud Creek
Location4E Spalding
RouteState Highway 91
Coordinates41.6833, -98.2906
Functional classRural Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating37.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length82 ft (25 m)
Longest span32 ft (9.8 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,215 (2018)
Projected traffic1,762 by 2038
Trucks14%
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

OwnerState Highway Agency
Maintained byState 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 N91 over Mud Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is N91 over Mud Creek 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 May 2023.

How much traffic does N91 over Mud Creek carry?

About 1,215 vehicles per day (2018 count), of which roughly 14% are trucks.

How long is N91 over Mud Creek?

The structure is 82 ft (25 m) long with a longest span of 32 ft (9.8 m) and a deck 39 ft wide.

Who owns N91 over Mud Creek?

It is owned by the State Highway Agency.