US Bridges

Local over Montgomery Creek

Poor

Boone County, Iowa · 085253102 · Structure no. 000000000078210

Built
1915
110 years old
Condition
Poor
inspected May 2024
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
5
2022 count
Owner
County
County Highway Agency

About this bridge

Local over Montgomery Creek is a concrete slab carrying Local over Montgomery Creek in Boone County, Iowa. It was built in 1915, so it is 110 years old, older than the Iowa average of 45.5 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 5 vehicles a day, projected to reach 5 by 2044. The structure is 23 ft (7 m) long and 18 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesLocal
CrossesMontgomery Creek
Location085253102
RouteCounty Highway 0
CountyBoone County
StateIowa
Coordinates42.13546, -93.81584
Functional classRural 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
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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating55.8 US tons
Inventory rating34.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span23 ft (7 m)
Deck width18 ft (5.5 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2022)
Projected traffic5 by 2044
Trucks0%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Local over Montgomery Creek built?

It was built in 1915, making it 110 years old in 2025.

What condition is Local over Montgomery Creek 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 Local over Montgomery Creek carry?

About 5 vehicles per day (2022 count).

How long is Local over Montgomery Creek?

The structure is 23 ft (7 m) long with a longest span of 23 ft (7 m) and a deck 18 ft wide.

Who owns Local over Montgomery Creek?

It is owned by the County Highway Agency.