Dewatering efforts deployed to keep the project on track

Northern Colorado has experienced relentless rain, tornadoes, severe thunderstorms, and the subsequent flooding from the heavy precipitation dump. The National Weather Service in Boulder reported nearly 4 inches of rain fell in the region Wednesday-Friday, with a record-setting amount of precipitation in Denver.

The 2.92 inches of rain that fell at KDEN was the 8th highest 1-day precipitation total for Denver. #cowx pic.twitter.com/pHm50Rn8QN

— NWS Boulder (@NWSBoulder) May 12, 2023

The historical downpour washed out plans to pour concrete at the roundabout, but proactive measures are being taken to mitigate the excess water and lost time. Crews will pump water out of the construction site, using hoses and pumps to vacuum the water and redistribute it to a safe location outside of the construction area. The crew will begin pouring once the site is dry and they receive the all-clear.

Click here to see the construction site soaked after heavy rains

Reminder: Beginning the week of May 15th (Weather Permitting)

Semis will enter westbound into the roundabout project limits from 35th Avenue and will deliver road construction materials during the day. Please do not follow the trucks. We expect truck traffic to last approximately one week (potentially two) and then the construction zone will close again. The road is still closed to non-construction traffic. Please use the existing detours (indicated in yellow on the map below). Also remember, neighborhoods are NOT detour routes.

Also on deck next week: final sub-surface work is being completed near the roundabout. Once the sub-surface work is complete, the crew will be able to begin pouring concrete, which should begin next week.

Thank you for your patience as we construct Evans' first roundabout!

Project Updates:

This Week: Week of May 8th

• Lowered electric line under the curb and gutter at the intersection of the roundabout. Marked the last electric line and are now waiting for a quality control check to ensure it is at the minimum depth.
• Rain began as concrete was ready to pour. Some locations are severely underwater due to multiple days of consistent rain. Crews are hoping to pump out rain water Friday or Saturday, depending on how the weather progresses.

Next Week: Week of May 15th (WEATHER PERMITTING)

• Cement is scheduled and ready to go. Once the site is given the go-ahead, pouring will commence for the roundabout itself and for the corners of the roundabout.
• Evaluating the road base, conducting soft-spot repair, and proof rolling after the area dries.

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The Road Ahead 1% Sales Tax Project:

When the residents of Evans voted to increase the city's annual street budget through The Road Ahead 1% sales tax for street maintenance and repair, the city made a commitment to enhance the safety and quality of its streets. On Wednesday, March 22nd, 2023, that commitment continues when the 37th Street roundabout breaks ground at the intersection of 47th Avenue and 37th Street. Officially titled Phase I - 37th Street Widening, this project will feature a hard closure that will be in place to increase the safety of the workers and decrease the time needed to complete the project. Detours are available, indicated in yellow on the map below, on 65th Avenue, US-34, 35th Avenue, and 49th Street.

Since The Road Ahead 1% sales tax for street maintenance and repair was passed in 2019, progress on the streets is palpable. The City of Evans has completed, broke ground on, or designed more than 40 infrastructure projects. Noticeable road improvements can be seen on 23rd Avenue, 37th Street, 47th Avenue, 35th Avenue, Idaho Street, and 31st Street. Additionally, the City has placed an emphasis on concrete replacement, storm sewer enhancement, and replacing the aging, underground utilities when it is required. Our alleyway improvement program has also served as an aesthetic and functional improvement to the roads.

According to several safety studies, roundabouts reduce traffic accidents and increase traffic flow. According to the IIHS:

• Studies of intersections in the United States converted from traffic signals or stop signs to roundabouts have found reductions in injury crashes of 72-80 percent and reductions in all crashes of 35-47 percent (Retting et al., 2001; Eisenman et al., 2004; Rodegerdts et al., 2007).
• A study of 19 higher-speed rural intersections (speed limits of 40 mph or higher) that originally had stop signs on the minor approaches and were converted to roundabouts found a 62 percent reduction in all crashes and an 85 percent reduction in injury crashes (Isebrands & Hallmark, 2012).
• Studies of intersections in Europe and Australia that were converted to roundabouts have reported 25-87 percent reductions in injury crashes and 36-61 percent reductions in all crashes (Rodegerdts et al., 2010).
• Based on the results of a 2004 study (Eisenman et al., 2004), it’s estimated that the conversion of 10 percent of the signalized intersections in the United States to roundabouts would have prevented approximately 51,000 crashes in 2018, including 231 fatal crashes and about 34,000 crashes involving injuries.

• A study of three intersections in Kansas, Maryland and Nevada where roundabouts replaced stop signs found that vehicle delays were reduced 13-23 percent and the proportion of vehicles that stopped was reduced 14-37 percent (Retting et al., 2002).
• A study of three locations in New Hampshire, New York and Washington state where roundabouts replaced traffic signals or stop signs found an 89 percent average reduction in vehicle delays and a 56 percent average reduction in vehicle stops (Retting et al., 2006).
• A study of 11 intersections in Kansas found a 65 percent average reduction in delays and a 52 percent average reduction in vehicle stops after roundabouts were installed (Russell et al., 2004).
• An Institute study of two-lane roundabout conversions at two intersections near Bellingham, Washington, found substantial declines in vehicle delays on the minor roads (33 percent and 90 percent) and the proportion of vehicles waiting in queues (35 percent and 43 percent) (Hu et al., 2014). Overall intersections delays increased (12 percent and 22 percent), due to slightly longer delays on the major approaches as vehicles slowed to enter the roundabouts.

The City will provide weekly updates on recently completed work and what to expect for the week ahead. More information on the project can be found on our website: https://www.evanscolorado.gov/news/post/607/