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SB I-35 over Drainage Ditch #29

Wright County, Iowa · rated Fair in the 2025 National Bridge Inventory

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

SB I-35 over Drainage Ditch #29 in Wright County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1974, making it 51 years old at the 2025 inventory.
It carries about 8,250 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 66 of the 175 inventoried bridges in Wright County rated fair (37.7%); 48 (27.4%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 150 ft
Location	1.3 mi N of SR C70
NBI structure number	000000000602600
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
NB I-35 over Drainage Ditch #29	1974	8,250	Good
I 35 NB over Iowa River	1974	8,250	Good
SB I-35 over Iowa River	1974	8,250	Fair
Ia 3 over White Fox Creek	1986	4,020	Good
Ia 3 over Eagle Creek	1932	3,450	Fair
Ia 3 over Little Eagle Creek	2016	3,450	Good