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136TH St over Br Walnut Creek

Jefferson County, Iowa · rated Good in the 2025 National Bridge Inventory

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

136TH St over Br Walnut Creek in Jefferson County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 8 (very good condition) on the 0-9 scale.
It was built in 2018, making it 7 years old at the 2025 inventory.
It carries about 40 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 70 of the 156 inventoried bridges in Jefferson County rated good (44.9%); 31 (19.9%) are rated poor.
Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
Its condition class and component ratings are unchanged from the 2024 inventory.
Its most recent inspection on record is dated February 2023, on a 48-month routine inspection cycle.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings

Component	Rating (2024)	Rating (2025)	FHWA scale meaning
Culvert	8	8	Very good condition


Structure	Steel culvert
Length	about 20 ft
Location	73081903
NBI structure number	000000000201921
Condition class	Good
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	February 2023
Inspection interval (item 91)	48 months
Scour (item 113)	8: foundations stable, scour above the top of the footing

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

Bridge	Built	Vehicles/day	Condition
US 34 EB over BNSF RR	2008	7,800	Good
US 34 WB over BNSF RR	2008	7,800	Good
US 34 over Mitchell Creek	2009	4,360	Good
Ia 1 over Crow Creek	1928	4,100	Fair
US 34 EB over Big Cedar Creek	2016	3,900	Fair
US 34 WB over Big Cedar Creek	2006	3,900	Good