Rich in mining history, the Mountain Mineral Belt design segment rises from the foothills. Dotted with historic towns including Idaho Springs and Georgetown, the Mountain Mineral Belt offers scenic views, lush forests, rocky hillsides, waterways, and access to local and regional destinations and recreational opportunities. The Mountain Mineral Belt design segment contains five Areas of Special Attention (ASA) including Floyd Hill, Twin Tunnels; Idaho Springs; DLD and Empire Junction; and Georgetown and Silver Plume.
The 1983 session of the Colorado General Assembly passed House Bill 1102 authorizing the Colorado Water Conservation Board (CWCB) to conduct a geotechnical study of dam sites in the White River Basin. The objective of the White River Geotechnical Study was to carry out surficial and sub surface geotechnical investigations of the designated dam sites and to locate and evaluate potential sources of construction material. The level of topographic data on the reservoir areas was to be upgraded.
In a cooperative effort, the Federal Highway Administration (FHWA), the Colorado Department of Transportation (CDOT), and the City and County of Denver (CCD) have prepared this Environmental Assessment (EA) for a proposed new interchange on Interstate 70 (I-70) with Central Park Boulevard (CPB) in Denver, Colorado. The proposed project will create new access to I-70, constituting a Federal Action subject to the National Environmental Policy Act (NEPA). This EA evaluates the socioeconomic and environmental impacts of the project as well as the traffic impacts to I-70 at the proposed interchange location.
"This plan, the result of a partnership among the Departments of Transportation of Colorado, New Mexico, Oklahoma, and Texas, outlines a series of priorities and steps to improve the corridor and serves as a tool for securing funding for corridor development. Funding for this planning project was provided by the U.S. Department of Transportation with the Colorado Department of Transportation serving as project manager."
Infiltration-induced landslides are common hazards to roads in Colorado. A new methodology that uses recent advances in unsaturated soil mechanics and hydrology was developed and tested. The approach consists of using soil suction and moisture content field information in the prediction of the likelihood of landslide movement. The testing ground was an active landslide on I-70 west of the Eisenhower/Johnson Memorial Tunnels. Results indicate that the unique hydrology of the site is a key component in its stability and considering the whole water basin and not just the failure area is important.
The main purpose of the CDOT Project Development Manual is to provide a quick, easy-to-use overview of situations or dilemmas that might be encountered in the course of developing a project. The manual is intended to assist new engineers, designers and consultants.
Truncated base mechanically stabilized earth walls are the MSE walls with narrow base excavation length and steep excavation slope designed to save construction cost while pushing the technological envelope of geosynthetic reinforcement development. A wall with truncated geometry of a narrow base length and steep excavation slope can significantly increase its base bearing pressure.
The Tunnel Visioning Design Workshop is the result of state and local interest in the I-70 Mountain Corridor and a desire for improvements to the existing weekend congestion. A focal point of the congestion and delay has long been the Twin Tunnel area. The Twin Tunnels encourage drivers to slow down as they approach the seemingly narrow tunnels. These slowing vehicles create a queue stretching back, sometimes, for 4 and 5 miles. It was decided to bring together technical experts in the areas of tunneling, roadway design, geotechnical engineering, traffic operations, and transit design for 1 week. The process, participants, and the results are detailed in this report.
This Environmental Assessment (EA) has been prepared for the Federal Boulevard Improvements Project. The stretch of Federal Boulevard in the Project Area is lined by commercial development with residential development behind the businesses. Federal Boulevard serves as a high travel-demand traffic corridor. This is a local-agency project sponsored by the City and County of Denver (CCD) in conjunction with CDOT and the Federal Highway Administration (FHWA) serving as joint lead agencies.