Final Environmental Assessment and Finding of No Significant Impact For the Proposed Safety of Dams Modifications and Bridge Reconstruction

The Bureau of Reclamation, Provo Area Office (Reclamation) proposes to replace the concrete spillway structure at Scofield Dam, the principal feature of the Scofield Project. This construction project would be completed under the Safety of Dams (SOD) Act of 1978 (Public Law 95-578, as amended). The proposed SOD modifications would correct safety deficiencies of the dam without affecting the purpose, or benefits of the dam. Reclamation also proposes to replace the existing gate house at its current position on the crest of the dam. This building is in poor condition and would be replaced with either a new concrete structure or a metal building

Investigating Project Bundling Practices for Transportation Construction Projects

Project Bundling is an innovative contract procurement strategy that is being widely used in bridge and highway projects to save project delivery time and costs. The guidebook developed by FHWA on project bundling also provides a wealth of information on project bundling. However, the guidebook is primarily focused on the project bundling practices that STAs adopted for bridge projects. Thus, a knowledge gap in project bundling for roadway projects (such as added travel lanes, resurfacing, intersection improvement, interchange work, shoulder rehabilitation and repair, etc.), might exist

Eastern Colorado Crest-Stage Network, 2018 through 2020: [Research Brief]

The objective of this study was to collect peak-streamflow data at the 10 sites in eastern Colorado identified in figure 1 using crest-stage gages for water years (October 1 to September 20) 2018-2020. The scope of this effort for each site each year includes survey levels, water level data collection, data entry, streamgage records, publication of peak streamflow, and site maintenance. Each site was located on an ephemeral stream that crossed through a culvert under a highway or county road. At each site, two crest-stage gages were installed, one was located approximately one culvert width upstream of the culvert entrance and the second was located approximately one culvert width downstream of the culvert exit to facilitate the computation of flood discharge. A crest-stage gage is a device that is used to economically record peak stage of a flood event. Typically, a crest-stage gage (figure 2) is comprised of a steel pipe fixed in a vertical position that is vented using several intake holes in the bottom of the pipe. When a flood occurs, the pipe fills to the flood stage level outside the pipe. The flood stage level is recorded by a pressure transducer mounted at a known elevation and cork dust deployed at the bottom of the pipe provides a replicate record of the peak stage. Once the peak stage is recorded, the peak discharge can be determined using the culvert indirect discharge method. Crest-stage gages require less infrastructure to operate and do not require telemetry, which results in cost savings over traditional streamgages. Pressure transducers allow for a complete stage record to be collected instead of simply the peak stage. Installing crest-stage gages equipped with pressure transducers provided an economic alternative to installing and operating traditional streamgages particularly in ephemeral streams common in eastern Colorado because the cork dust method simply leaves evidence of the peak water level that occurred during a flood and does not provide information on duration or timing of the peak. The crest-stage gages with pressure transducers and cork dust were be operated seasonally during late spring, summer, and early fall when the peak streamflow is most likely to occur. The crest-stage gages were still operated during late fall, winter, or early spring with traditional cork dust only because this time of year most streams in eastern Colorado are dry

Development of Environmental Product Declarations (EPDs) for Sustainable Pavement Procurement [Research Brief]

HB 21-1303, the \u201cBuy Clean Colorado Act\u201d requires contractors to submit EPDs for asphalt and asphalt mixtures, cement and concrete mixtures, and steel installed on CDOT projects. Ultimately, the bill instructs CDOT to establish greenhouse gas (GHG) emission limits for these materials, and contractors on CDOT construction projects will need to comply with the specified limits. The objectives of this study were to assess the current state-of-the-practice of EPDs in construction material manufacturing; to educate stakeholders regarding life cycle assessment (LCA) and EPDs; and to help develop protocols uniquely suited to Colorado that CDOT and material producers can use to integrate EPDs into the framework of Buy Clean Colorado

Application of a sediment-transport model to estimate bridge scour at selected sites in Colorado, 1991-93 /

Shipping list no.: 96-0096-P.Includes bibliographical references (p. 10-11).Mode of access: Internet