US Bridges

MI 2.8 Thompson over Rocky Coulee Wasteway

PoorPosted for load

Grant County, Washington · Nr Moses Lake Wa · Structure no. 11ELC0013

Built
1950
75 years old
Condition
Poor
inspected November 2023
Type
Truss - Thru
Steel
Length
81 ft
1 main span
Daily traffic
10
2023 count
Owner
Federal
Bureau of Reclamation

About this bridge

MI 2.8 Thompson over Rocky Coulee Wasteway is a steel truss - thru carrying MI 2.8 Thompson over Rocky Coulee Wasteway in Grant County, Washington. It was built in 1950, so it is 75 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 10 vehicles a day, projected to reach 10 by 2043. The structure is 81 ft (24.6 m) long and 12 ft wide.

Location

Open in Google Maps
CarriesMI 2.8 Thompson
CrossesRocky Coulee Wasteway
LocationNr Moses Lake Wa
CountyGrant County
StateWashington
Coordinates47.181, -119.2018
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating13.9 US tons
Inventory rating8.3 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadOther
Structure length81 ft (24.6 m)
Longest span80 ft (24.4 m)
Deck width12 ft (3.8 m)
Roadway width11 ft (3.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2023)
Projected traffic10 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Reclamation
Maintained byOther Local Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was MI 2.8 Thompson over Rocky Coulee Wasteway built?

It was built in 1950, making it 75 years old in 2025.

What condition is MI 2.8 Thompson over Rocky Coulee Wasteway in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2023.

How much traffic does MI 2.8 Thompson over Rocky Coulee Wasteway carry?

About 10 vehicles per day (2023 count).

How long is MI 2.8 Thompson over Rocky Coulee Wasteway?

The structure is 81 ft (24.6 m) long with a longest span of 80 ft (24.4 m) and a deck 12 ft wide.

Who owns MI 2.8 Thompson over Rocky Coulee Wasteway?

It is owned by the Bureau of Reclamation and maintained by the Other Local Agency.