US Bridges

S 200 over Drainage

Poor

Dawson County, Montana · 10M SW Richey · Structure no. P00051017+01831

Built
1959
66 years old
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
57 ft
3 main spans
Daily traffic
307
2023 count
Owner
State
State Highway Agency

About this bridge

S 200 over Drainage is a wood or timber stringer/multi-beam or girder carrying S 200 over Drainage in Dawson County, Montana. It was built in 1959, so it is 66 years old, older than the Montana average of 47 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.

It carries about 307 vehicles a day, roughly 13% of them trucks, projected to reach 322 by 2043. The structure is 57 ft (17.4 m) long and 38 ft wide. If it were closed, the detour would be 70.2 mi (113 km).

Location

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CarriesS 200
CrossesDrainage
Location10M SW Richey
RouteState Highway 200
CountyDawson County
StateMontana
Coordinates47.56156, -105.24961
Functional classRural Minor Arterial

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
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 15
Structure length57 ft (17.4 m)
Longest span19 ft (5.8 m)
Deck width38 ft (11.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic307 (2023)
Projected traffic322 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed70.2 mi (113 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$134,000
NavigationNo navigation control on waterway

Frequently asked questions

When was S 200 over Drainage built?

It was built in 1959, making it 66 years old in 2025.

What condition is S 200 over Drainage 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 September 2024.

How much traffic does S 200 over Drainage carry?

About 307 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is S 200 over Drainage?

The structure is 57 ft (17.4 m) long with a longest span of 19 ft (5.8 m) and a deck 38 ft wide.

Who owns S 200 over Drainage?

It is owned by the State Highway Agency.