Feb. 10, 2023

Work Continues Despite Cold, Snowy January

A year ago, the average temperature on site was 34 degrees. This January, that number dropped to 25 degrees. Despite frigid temperatures and snowstorms that left the valley covered in snow for most of the month, many crews were able to continue work with a few adjustments.

Arguably, one of the best places to be on site in the winter is in the heated tunnel to allow work with concrete and grout to continue. 

When concrete is placed outside of the tunnel, specific areas of the foundation are heated to keep the foundation warm enough to receive the concrete. After placement, concrete blankets are utilized to trap the heat generated during the curing process. In extreme cold temperatures, heaters will be used. 

Grouting operations can typically continue as grout is placed underground and not exposed to freezing temperatures. 

Snow-covered view of the Chimney Hollow site.

With a few adjustments, the Chimney Hollow Conduit and backfill continued to be placed throughout the month, as well as placing rockfill for the main dam embankment and complete concrete plinth sections. Ground heaters are used to keep specific areas from freezing. [JD1] 

When it comes to the heavy equipment, safety is the first priority. When roads are unsafe due to mud, snow, and/or ice, haul trucks do not operate. 

The only work that is temperature limited and gets shut down due to freezing temperatures is the asphalt core and embankment shells. The core can only be placed if the temperature is 25 degrees and rising. Embankment materials cannot be placed when frozen or on frozen ground.

If Mother Nature brings us a very cold Colorado day with below zero temperatures, on-site work will be shut down for safety reasons.