ITD advances plans for 5-lane highway
Project could cost $62 million or more
By GREGORY FOLEY
Express Staff Writer
Officials from the Idaho Transportation
Department last week said they dropped two design alternatives from a list of
options for expanding Highway 75 because they would be too expensive and would
have excessive environmental impacts.
ITD officials presented the findings at an
open-house meeting Thursday evening at Wood River Middle School in Hailey. The
meeting was designed to provide explanations for why ITD and its consultants
have narrowed to two the field of potential highway-expansion designs, and what
the impacts would be if one of those two remaining plans was approved and
constructed.
ITD late last year discontinued research
on proposed three-lane and seven-lane options, and decided to focus its
attention on two comparable designs that propose four and five lanes through
most areas.
Material presented last week stated that
the so-called "Enhanced 3-lane" design—which proposed two lanes with a center
turn lane through much of the Wood River Valley—was dropped because:
- It would have required high costs to
acquire lands to widen the highway right of way and gain land for frontage
roads.
- It would have resulted in a total
pavement "footprint" larger than any other alternative because it required
frontage roads for access.
- It would have had a significant
detrimental impact on the community because of its cost, limited access and
overall size.
The so-called "Level of Service C"
alternative that was also eliminated had proposed a significantly wider design
put forth for the project to meet the state’s minimum standard for traffic flow
through the region. The design called for three lanes in each direction plus a
center-turn lane from Buttercup Road north of Hailey to Serenade Lane just south
of Ketchum.
ITD said that option was dropped because:
- It would have had greater impacts to
adjacent properties and historic properties in the valley because of overall
width and size.
- It would have created excessive costs
to acquire right of way.
- It would have generated significant
community impacts while providing only a marginal improvement in traffic flow
compared to the favored five-lane options.
Diana Atkins, an ITD consultant from
Utah-based Parsons-Brinckerhoff, said project managers have estimated that the
two remaining options to expand the highway—which are being advanced with a
so-called "No-build option" for study in a draft environmental-impact
statement—will be studied by members of various state and federal agencies in
future weeks to assess their impacts.
The two expansion alternatives still under
consideration essentially propose the same configuration of four travel lanes
plus a center-turn lane through most of the 27-mile stretch, from Timmerman
Junction at U.S. 20 north through Ketchum to Saddle Road. But one of the two
plans would include one designated high-occupancy vehicle lane in each direction
from McKercher Boulevard in Hailey to Elkhorn Road.
Both alternatives propose three options
that could be built for the route from Elkhorn Road to Trail Creek Bridge in
Ketchum, including two-, three-, and four-lane designs.
Atkins on Thursday said construction of
either of the five-lane designs through the entire corridor has been projected
to cost from $40 million to $44 million to construct, plus an estimated $17
million to $18 million to acquire lands for right of way.
"But that (right of way) number is likely
to go up," she said.
She noted the right-of-way projections
were based on assumptions that ITD would need to acquire between 108 and 178
acres of land at a cost of $250,000 per acre north of Hailey. Land south of
Bellevue has been projected to cost $50,000 per acre.
Atkins said ITD plans to release the draft
EIS before the end of the year, and at that time will open an approximately
60-day public comment period on the document.