US Bridges

Ferris Mill RD over Br Upper Iowa River

Good

Allamakee County, Iowa · 099061904 · Structure no. 000000000062921

Built
2017
8 years old
Condition
Good
inspected April 2022
Type
Slab
Concrete
Length
41 ft
1 main span
Daily traffic
70
2022 count
Owner
County
County Highway Agency

About this bridge

Ferris Mill RD over Br Upper Iowa River is a concrete slab carrying Ferris Mill RD over Br Upper Iowa River in Allamakee County, Iowa. It was built in 2017, so it is 8 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 70 vehicles a day, projected to reach 70 by 2043. The structure is 41 ft (12.5 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFerris Mill RD
CrossesBr Upper Iowa River
Location099061904
RouteCounty Highway 0
CountyAllamakee County
StateIowa
Coordinates43.3716, -91.60906
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating51 US tons
Inventory rating39.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length41 ft (12.5 m)
Longest span40 ft (12.2 m)
Deck width26 ft (7.8 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2022)
Projected traffic70 by 2043
Trucks0%
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 Ferris Mill RD over Br Upper Iowa River built?

It was built in 2017, making it 8 years old in 2025.

What condition is Ferris Mill RD over Br Upper Iowa River 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 April 2022.

How much traffic does Ferris Mill RD over Br Upper Iowa River carry?

About 70 vehicles per day (2022 count).

How long is Ferris Mill RD over Br Upper Iowa River?

The structure is 41 ft (12.5 m) long with a longest span of 40 ft (12.2 m) and a deck 26 ft wide.

Who owns Ferris Mill RD over Br Upper Iowa River?

It is owned by the County Highway Agency.