NV5 - Pedestrian Mousehole

SR-89 Mousehole

The double-track State Route (SR) 89 “Mousehole,” originally an early 1900s rock and stone arched opening, allows traffic to pass beneath the historic Central Pacific Railroad. This improvement project created a new, multi-use pedestrian and bicycle undercrossing through the railroad embankment, immediately east of the Mousehole.

On behalf of HDR Engineering, Inc., and the Town of Truckee, NV5 characterized environmental conditions and prepared a soil management plan to address contamination of the pedestrian tunnel during development.

The new tunnel was built by boring and jacking of precast concrete tunnel segments, with a Class I multi-use pathway (MUP) built through the new tunnel.


Truckee, CA


HDR Engineering, Inc.; Town of Truckee


Site Characterization &
Environmental Remediation


Helen Putnam Award – Public Works, Infrastructure and Transportation, League of California Cities, 2018 (awarded to client)