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Tr 99 over La Harpe

Hancock County, Illinois · rated Poor in the 2025 National Bridge Inventory

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

Tr 99 over La Harpe in Hancock County, Illinois, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
It was built in 1974, making it 51 years old at the 2025 inventory.
It carries about 50 vehicles a day (traffic count year 2023).
Its listed owner is a town or township highway agency.
It is one of 63 of the 290 inventoried bridges in Hancock County rated poor (21.7%); 63 (21.7%) 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	Prestressed concrete multiple box beam
Length	about 54 ft
Location	4.5 Mi S Laharpe
NBI structure number	034421100000000
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
US 136 over Hamilton Slough	1954	10,500	Good
US 136 over Miss R/1ST/KEOKUK Jct RR	1985	10,500	Fair
Il 336 over Trib to Praire CR	2006	4,200	Good
Il 94 (NB) over Slater Creek	2003	4,050	Fair
Il 94 (SB) over Slater Creek	2002	4,050	Fair
US 136 over Il 336	2006	4,000	Good