Home › Hawaii › Hawaii County › Old Mamalahoa Hwy over Opea Stream

Old Mamalahoa Hwy over Opea Stream

Hawaii County, Hawaii · rated Poor in the 2025 National Bridge Inventory

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

Old Mamalahoa Hwy over Opea Stream in Hawaii County, Hawaii, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1912, making it 113 years old at the 2025 inventory.
It carries about 20 vehicles a day (traffic count year 1986).
Its listed owner is the county highway agency.
It is one of 8 of the 231 inventoried bridges in Hawaii County rated poor (3.5%); 8 (3.5%) 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	Concrete stringer or multi-beam girder
Length	about 41 ft
Location	Tmk: 3-2-001:018
NBI structure number	001310001100002
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
Hawaii Belt Rd over Panaewa Strm	1950	35,200	Fair
Keeau-pahoa Hwy over Waipahoehoe Strm	1968	26,700	Good
Route 11 over Unmd Glh	1984	25,900	Good
Route 11 over Unmd Glh	1984	25,400	Good
Hi Blt Rd Palani R over Unmd Glh Tpl Mtl Culvt	1984	25,400	Good
Route 11 over Unmd Glh	1984	25,400	Good