Birds and girders, revisited: Classic mismatch as ITD clears hurdles to arrive at Aug. 15 ribbon cutting
The great blue heron is about 4 feet tall and weighs in at maybe 6 pounds. The bridge is more than 1,720 feet long, 88 feet wide and tips the scales at 38 million pounds. Not since Oscar and Felix in the "Odd Couple" has there been a more striking difference.
But The Little Guy – the pencil-legged heron -- does not compete with The Behemoth. In fact, the relationship is one of peaceful coexistence.
That relationship remains long after the Aug. 15 ribbon cutting.
Thanks to a thorough process before the first shovel of dirt was ever turned, the effects to wildlife and the environment have been minimized during the construction of a huge bridge across the Boise River near the junction of Idaho 16 and Idaho 44. Supporters envision it eventually connecting Emmett with Interstate 84.
To avoid impacts to great blue heron courtship and nesting, vegetation removal and construction activities were prohibited within a 925-foot radius of any known or identified heron rookeries during spring and early summer.
"The contract was very specific about staying out of the area during the blue heron and eagle nesting seasons when construction first started," explained Dana Weiss, ITD project manager.
On a given day you'll see blue heron, cattle egrets, turkey, falcons, hawks, redwing blackbirds and swallows near the bridge. Juvenile eagles thrive. Deer tracks abound.
A 2.5-mile extension of Idaho 16 is nearly complete, connecting Chinden Boulevard (U.S. 20/26) to State Street (Idaho 44), including construction of the bridge over the Boise River.
More than 1.5 million pounds of rebar and 36.6 million pounds of concrete were used in the construction of the massive bridge. The $39 million bridge is funded by Grant Anticipation Revenue Vehicle bonds.
Although construction started just over two years ago (May 2012), the environmental coordination began much earlier.
"Because of community and agency coordination and support for the project, the Environmental Impact Statement was completed in record time – just four years and three months, significantly faster than the national average for a project of this size and complexity," said ITD southwest Idaho Engineering Manager of Development, Amy Schroeder.
ITD coordinated extensively with regulatory agencies, the public and land-use groups to determine values and work through concerns. To meet all environmental requirements for the sensitive river-crossing construction, ITD completed all needed documents and permits, including the Environmental Impact Statement and acquisition of permits along with permits for wetland mitigation, clean water, stream alteration and floodplain development.
A lot of work went toward honoring commitments made as the project moved from the design stage to construction, said ITD's southwest Idaho Environmental Manager, Greg Vitley.
"Early and good coordination throughout the project keeps people informed and happy, and that rapport with stakeholders makes it easier to deal with any problems that might develop."
Avoiding and minimizing impacts was a big part of the coordination with resource agencies and other stakeholders as the project was being planned," Vitley added.
Commitments were established in the contract language for the bridge project to help minimize impacts to the environment. Here is a short list of items that were addressed in the contract:
WILDLIFE: Vegetation removal is minimized and restricted during specific periods to protect nesting season for migratory birds, which are included in the Migratory Bird Treaty Act. Great blue heron foraging habitat is located within the vicinity of the project.
AIR: The construction contractor must control air contaminants such as equipment emissions and dust that could harm crops, damage dwellings, or become a visibility nuisance. Actions addressed may include regularly spraying dusty areas with water, or covering trucks that are hauling dirt or debris in an open bed. The contractor also is required to promptly clean up spills of transported material on public roadways.
Wind fencing also is used to buffer wind velocities and minimize wind damage, such as soil erosion and snow drifting.
WATER QUALITY: Continuous monitoring of water quality during in-stream work ensures the project conforms to state water-quality standards.
FUEL: The restrictions require low-sulfur fuel to reduce both sulfur dioxide and particulate-matter emissions from engines.
RE-VEGETATE: Long-term soil stabilization is achieved by re-vegetating exposed areas with native plants when the areas are no longer needed for project construction.
CONTINUING COORDINATION WITH REGULATORY AGENCIES: Regular meetings with state and federal regulatory agencies keep regulators informed and help them address concerns quickly.
Weiss added that the right of way is fenced to keep animals off the highway.
Editor's Note: According to AASHTO Communications Director Lloyd Brown, this is the first time in his memory that a state's feature story has been used in the AASHTO Journal.