US Bridges

717 RD-638/639 Av over Porter Branch

FairPosted for load

Richardson County, Nebraska · 1S 4.7W STEL(717-638/639) · Structure no. C007400810

Built
1935
90 years old, rebuilt 2010
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
54 ft
2 main spans
Daily traffic
45
2022 count
Owner
County
County Highway Agency

About this bridge

717 RD-638/639 Av over Porter Branch is a steel stringer/multi-beam or girder carrying 717 RD-638/639 Av over Porter Branch in Richardson County, Nebraska. It was built in 1935 and reconstructed in 2010, so it is 90 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 45 vehicles a day, projected to reach 76 by 2041. The structure is 54 ft (16.5 m) long and 27 ft wide. If it were closed, the detour would be 18.6 mi (30 km).

Location

Open in Google Maps
Carries717 RD-638/639 Av
CrossesPorter Branch
Location1S 4.7W STEL(717-638/639)
RouteCounty Highway 7886
CountyRichardson County
StateNebraska
Coordinates40.2181, -95.8573
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.5 US tons
Inventory rating15.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length54 ft (16.5 m)
Longest span30 ft (9.1 m)
Deck width27 ft (8.1 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2022)
Projected traffic76 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18.6 mi (30 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 717 RD-638/639 Av over Porter Branch built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 2010.

What condition is 717 RD-638/639 Av over Porter Branch 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 March 2024.

How much traffic does 717 RD-638/639 Av over Porter Branch carry?

About 45 vehicles per day (2022 count).

How long is 717 RD-638/639 Av over Porter Branch?

The structure is 54 ft (16.5 m) long with a longest span of 30 ft (9.1 m) and a deck 27 ft wide.

Who owns 717 RD-638/639 Av over Porter Branch?

It is owned by the County Highway Agency.