Umauma Stream Bridge

One of the tallest bridges on the Big Island’s Hāmākua Coast is Umauma Stream Bridge. This structure on Hawaii Belt Road is situated approximately 12 miles Northwest of Hilo and provides two 12-ft lanes and two 8-ft shoulders for the traveling public. It is a critical component in the roadway system that encircles the island.

Incorporating advanced materials and components in the design allowed for the preservation of the important historic features of this steel trestle bridge. Innovative elements included Triple Pendulum Isolators to reduce seismic forces, negative batter Mechanically Stabilized Earth to remove lateral loading on the existing abutment, precast deck panels and Ultra-High Performance Concrete to accelerate construction, and two-way post-tensioning to minimize the possibility of cracking of the concrete deck. The bridge was also designed with no expansion joints in the deck to decrease future maintenance and increase longevity.

KSF, Inc. was the structural engineering consultant for this project.  In addition, we provided construction engineering services which included girder lifting and bracing drawings, precast deck panel placement plans and quality control for the construction of structural components.


2020 Engineering Excellence Grand Conceptor Award, American Council of Engineering Companies of Hawaii