US Bridges

SR 1 over Watson Ditch

Good

Allen County, Indiana · 09.07 S SR 8 · Structure no. 000470

Built
1941
84 years old
Condition
Good
inspected July 2024
Type
Culvert
Concrete
Length
39 ft
1 main span
Daily traffic
2,700
2022 count
Owner
State
State Highway Agency

About this bridge

SR 1 over Watson Ditch is a concrete culvert carrying SR 1 over Watson Ditch in Allen County, Indiana. It was built in 1941, so it is 84 years old, older than the Indiana average of 46.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,700 vehicles a day, roughly 6% of them trucks, projected to reach 3,260 by 2042. The structure is 39 ft (12 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSR 1
CrossesWatson Ditch
Location09.07 S SR 8
RouteState Highway 1
CountyAllen County
StateIndiana
Coordinates41.25676, -84.95302
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating100 US tons
Inventory rating100 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length39 ft (12 m)
Longest span30 ft (9.1 m)
Deck width30 ft (9.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,700 (2022)
Projected traffic3,260 by 2042
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 1 over Watson Ditch built?

It was built in 1941, making it 84 years old in 2025.

What condition is SR 1 over Watson Ditch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.

How much traffic does SR 1 over Watson Ditch carry?

About 2,700 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is SR 1 over Watson Ditch?

The structure is 39 ft (12 m) long with a longest span of 30 ft (9.1 m) and a deck 30 ft wide.

Who owns SR 1 over Watson Ditch?

It is owned by the State Highway Agency.