US Bridges

Adgate Rd. over Ottawa River Adgate RD

PoorPosted for load

Allen County, Ohio · 0.02 MI W of Ft Amanda · Structure no. 0249750

Built
1972
53 years old
Condition
Poor
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
155 ft
3 main spans
Daily traffic
3,457
2019 count
Owner
County
County Highway Agency

About this bridge

Adgate Rd. over Ottawa River Adgate RD is a steel continuous stringer/multi-beam or girder carrying Adgate Rd. over Ottawa River Adgate RD in Allen County, Ohio. It was built in 1972, so it is 53 years old, older than the Ohio average of 47.3 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 3,457 vehicles a day, roughly 5% of them trucks, projected to reach 4,585 by 2035. The structure is 155 ft (47.1 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesAdgate Rd.
CrossesOttawa River Adgate RD
Location0.02 MI W of Ft Amanda
RouteCounty Highway T0122
StateOhio
Coordinates40.71576, -84.13806
Functional classUrban 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.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating17.5 US tons
Inventory rating10.4 US tons

Structure

MaterialSteel Continuous
DeckCorrugated steel
Main spans3
Design loadH 20
Structure length155 ft (47.1 m)
Longest span50 ft (15.1 m)
Deck width36 ft (11 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,457 (2019)
Projected traffic4,585 by 2035
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Adgate Rd. over Ottawa River Adgate RD built?

It was built in 1972, making it 53 years old in 2025.

What condition is Adgate Rd. over Ottawa River Adgate RD 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 May 2024.

How much traffic does Adgate Rd. over Ottawa River Adgate RD carry?

About 3,457 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is Adgate Rd. over Ottawa River Adgate RD?

The structure is 155 ft (47.1 m) long with a longest span of 50 ft (15.1 m) and a deck 36 ft wide.

Who owns Adgate Rd. over Ottawa River Adgate RD?

It is owned by the County Highway Agency.