US Bridges

RD 20 over Warm Slough

GoodPosted for load

Merrick County, Nebraska · 3.7E 1.4N Central City · Structure no. C006103905P

Built
1968
57 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
40 ft
2 main spans
Daily traffic
25
2003 count
Owner
County
County Highway Agency

About this bridge

RD 20 over Warm Slough is a wood or timber stringer/multi-beam or girder carrying RD 20 over Warm Slough in Merrick County, Nebraska. It was built in 1968, so it is 57 years old, older 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. Its operating status is: posted for load restriction.

It carries about 25 vehicles a day, projected to reach 42 by 2035. The structure is 40 ft (12.2 m) long and 22 ft wide. If it were closed, the detour would be 37.3 mi (60 km).

Location

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CarriesRD 20
CrossesWarm Slough
Location3.7E 1.4N Central City
RouteCounty Highway 0P39
CountyMerrick County
StateNebraska
Coordinates41.1444, -97.9199
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating6.6 US tons
Inventory rating3.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span19 ft (5.8 m)
Deck width22 ft (6.7 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2003)
Projected traffic42 by 2035
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 RD 20 over Warm Slough built?

It was built in 1968, making it 57 years old in 2025.

What condition is RD 20 over Warm Slough 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 September 2023.

How much traffic does RD 20 over Warm Slough carry?

About 25 vehicles per day (2003 count).

How long is RD 20 over Warm Slough?

The structure is 40 ft (12.2 m) long with a longest span of 19 ft (5.8 m) and a deck 22 ft wide.

Who owns RD 20 over Warm Slough?

It is owned by the County Highway Agency.