US Bridges

Trail Z81 & Z85 over Timber Creek

GoodPosted for load

Riley County, Kansas · 765-510 · Structure no. DAPFORRIL000901

Built
1923
102 years old
Condition
Good
inspected July 2023
Type
Tee Beam
Concrete
Length
33 ft
1 main span
Daily traffic
5
2019 count
Owner
Federal
Army

About this bridge

Trail Z81 & Z85 over Timber Creek is a concrete tee beam carrying Trail Z81 & Z85 over Timber Creek in Riley County, Kansas. It was built in 1923, so it is 102 years old, older than the Kansas average of 52.8 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 5 vehicles a day, roughly 10% of them trucks, projected to reach 10 by 2044. The structure is 33 ft (10.1 m) long and 20 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesTrail Z81 & Z85
CrossesTimber Creek
Location765-510
StateKansas
Coordinates39.2925, -96.95383
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating18.2 US tons
Inventory rating13.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span30 ft (9.1 m)
Deck width20 ft (6.2 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2019)
Projected traffic10 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerArmy
Maintained byArmy
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$14,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Trail Z81 & Z85 over Timber Creek built?

It was built in 1923, making it 102 years old in 2025.

What condition is Trail Z81 & Z85 over Timber 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 July 2023.

How much traffic does Trail Z81 & Z85 over Timber Creek carry?

About 5 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is Trail Z81 & Z85 over Timber Creek?

The structure is 33 ft (10.1 m) long with a longest span of 30 ft (9.1 m) and a deck 20 ft wide.

Who owns Trail Z81 & Z85 over Timber Creek?

It is owned by the Army.