US Bridges

646 Ave over Big Nemaha River Trib

Good

Richardson County, Nebraska · 75/N8 6E1.8N(646-707/708) · Structure no. C007423305

Built
2018
7 years old
Condition
Good
inspected April 2022
Type
Culvert
Steel
Length
28 ft
3 main spans
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

646 Ave over Big Nemaha River Trib is a steel culvert carrying 646 Ave over Big Nemaha River Trib in Richardson County, Nebraska. It was built in 2018, so it is 7 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 100 vehicles a day, projected to reach 130 by 2041. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 37.3 mi (60 km).

Location

Open in Google Maps
Carries646 Ave
CrossesBig Nemaha River Trib
Location75/N8 6E1.8N(646-707/708)
RouteCounty Highway 3645
CountyRichardson County
StateNebraska
Coordinates40.0842, -95.7092
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert9 ExcellentNo problems noted.
Last inspectionApril 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.4 US tons
Inventory rating36.4 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span7 ft (2.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic130 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed37.3 mi (60 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was 646 Ave over Big Nemaha River Trib built?

It was built in 2018, making it 7 years old in 2025.

What condition is 646 Ave over Big Nemaha River Trib 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 April 2022.

How much traffic does 646 Ave over Big Nemaha River Trib carry?

About 100 vehicles per day (2022 count).

How long is 646 Ave over Big Nemaha River Trib?

The structure is 28 ft (8.5 m) long with a longest span of 7 ft (2.2 m).

Who owns 646 Ave over Big Nemaha River Trib?

It is owned by the County Highway Agency.