US Bridges

Monument RD over Tawas River

Fair

Iosco County, Michigan · 150 Ft SE of Nunn · Structure no. 000000000004137

Built
1981
44 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
90 ft
2 main spans
Daily traffic
4,030
2006 count
Owner
County
County Highway Agency

About this bridge

Monument RD over Tawas River is a prestressed concrete box beam or girders - multiple carrying Monument RD over Tawas River in Iosco County, Michigan. It was built in 1981, so it is 44 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 4,030 vehicles a day, roughly 10% of them trucks, projected to reach 7,250 by 2026. The structure is 90 ft (27.4 m) long and 41 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMonument RD
CrossesTawas River
Location150 Ft SE of Nunn
RouteCounty Highway 3557
CountyIosco County
StateMichigan
Coordinates44.2832, -83.50467
Functional classRural Major 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56.8 US tons
Inventory rating34 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length90 ft (27.4 m)
Longest span43 ft (13.1 m)
Deck width41 ft (12.6 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,030 (2006)
Projected traffic7,250 by 2026
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Monument RD over Tawas River built?

It was built in 1981, making it 44 years old in 2025.

What condition is Monument RD over Tawas 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 June 2024.

How much traffic does Monument RD over Tawas River carry?

About 4,030 vehicles per day (2006 count), of which roughly 10% are trucks.

How long is Monument RD over Tawas River?

The structure is 90 ft (27.4 m) long with a longest span of 43 ft (13.1 m) and a deck 41 ft wide.

Who owns Monument RD over Tawas River?

It is owned by the County Highway Agency.