US Bridges

Pl Cnty RD 109S over Laramie River

Fair

Platte County, Wyoming · T26N R065W S32 · Structure no. DQT

Built
1980
45 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
112 ft
3 main spans
Daily traffic
75
2024 count
Owner
County
County Highway Agency

About this bridge

Pl Cnty RD 109S over Laramie River is a prestressed concrete stringer/multi-beam or girder carrying Pl Cnty RD 109S over Laramie River in Platte County, Wyoming. It was built in 1980, so it is 45 years old, younger than the Wyoming average of 48.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 75 vehicles a day, roughly 8% of them trucks, projected to reach 105 by 2043. The structure is 112 ft (34.1 m) long and 34 ft wide. If it were closed, the detour would be 34.8 mi (56 km).

CarriesPl Cnty RD 109S
CrossesLaramie River
LocationT26N R065W S32
RouteCounty Highway 109S
StateWyoming
Coordinates42.18683, -104.68192
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating60.1 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length112 ft (34.1 m)
Longest span35 ft (10.7 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2024)
Projected traffic105 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.8 mi (56 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$5,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Pl Cnty RD 109S over Laramie River built?

It was built in 1980, making it 45 years old in 2025.

What condition is Pl Cnty RD 109S over Laramie River 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 November 2023.

How much traffic does Pl Cnty RD 109S over Laramie River carry?

About 75 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is Pl Cnty RD 109S over Laramie River?

The structure is 112 ft (34.1 m) long with a longest span of 35 ft (10.7 m) and a deck 34 ft wide.

Who owns Pl Cnty RD 109S over Laramie River?

It is owned by the County Highway Agency.