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Ada County Highway District Bridges
Ada County Highway District
OVERVIEW
Over the past several years, Keller Associates has provided design
and construction support on about 20 different single span bridge
projects throughout Ada County, Idaho. Design projects have ranged
from full bridge replacement to innovative rehabilitation measures
to extend bridge life. All bridges were associated with waterways,
drainages, or canals.
CHALLENGE
Although each project is different, several recurring issues emerged.
Challenges were associated with determining the best bridge type
for the project, construction traffic control during bridge construction,
hydraulics of waterways, wetland impacts and permitting, water quality
concerns and storm water treatment, canal company and irrigation
district coordination, and addressing roadway approach improvements
along with safety and guardrail at the bridge ends.
SOLUTION
Projects began with analysis of bridge types to select the most economical
and practical solution. Some projects allowed road closure where
reasonable detours were available while others required staged construction.
We focused on close coordination with canal companies, irrigation
districts, and regulatory agencies, so necessary approvals were granted
during the design process. Quality and attention to detail were built
into the design and preparation of our plans and specifications.
Effective best management practices were designed to address water
quality concerns. |
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