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Local over Trib to Maple River

Monona County, Iowa · rated Poor in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Local over Trib to Maple River in Monona County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 2 (critical condition) on the 0-9 scale.
It was built in 1900, making it 125 years old at the 2025 inventory.
It carries about 5 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 41 of the 160 inventoried bridges in Monona County rated poor (25.6%); 41 (25.6%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Timber stringer or multi-beam girder
Length	about 76 ft
Location	083440102
NBI structure number	000000000250110
Condition class	Poor

Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.

Bridge	Built	Vehicles/day	Condition
NB I-29 over Robinson Ditch	2011	7,800	Good
SB I-29 over Robinson Ditch	2009	7,800	Good
NB I-29 over Cleghorn Creek	2012	7,250	Good
SB I-29 over Cleghorn Creek	2011	7,250	Good
Ia 175 over Mccandlesscleghorn Ditch	2023	5,300	Good
Ia 175 over I-29	1959	4,090	Poor