Projects

Watershed Projects Preserve Water Quality

There are numerous factors that affect water quality in the Chatfield Reservoir, with some having a larger impact. As the uses of the reservoir change, and the growth of the urban areas continue, so does the impact of pollution. Projects preserve water quality in the Chatfield watershed and reservoir. Projects address:

  • Agricultural Activities

  • Septic Systems

  • Streambank Stabilization

  • Wildfire Management

  • Water Quality and Habitat Improvements

  • Plum Creek Water Monitoring

Projects

2023

Colorado School of Mines Chatfield Watershed Field Session 2023

Overarching goals for the session:

1. Obtain and document a snapshot-in time of water quality in the Chatfield watershed tributary creeks through sampling and testing of water quality parameters of concern and streamflow rates.

2. Interpret the potential linkages between the watershed soils/geology/land uses on the sampled water quality constituents.

3. Provide advice on possible measures to improve the quality of water in the Chatfield watershed.

4. Report and present findings to representatives of the Authority.

Projects

2022

Douglas County Willow Creek Stream Improvements at Sterling Ranch

Construction of the Willow Creek Stream Improvements at Sterling Ranch project started in October 2021 and concluded in February 2022. The large-scale project has restored a section of Willow Creek upstream of Chatfield Reservoir. Sponsored by the Sterling Ranch Community Authority Board, the Mile High Flood District, and Douglas County; the stream-restoration project rehabilitated nearly 1-mile of stream channel, riparian habitat and floodplain between Rampart Range Road and Waterton Road.

Prior to the project, the Willow Creek corridor was highly degraded. Eroding streambanks contributed large quantities of sediment to downstream receiving waterbodies. Wetland habitat and floodplain connectivity was deficient due to the incised nature of the channel. Residential development projects planned for the watershed would be contributing additional stormwater volume to Willow Creek, increasing stress on the natural system. Restoration and stabilization of the creek was necessary.

Outcomes of the completed project include:

  • Realigning and stabilizing 8,600 linear feet of streambank

  • Constructing 33 riffle-pool stream features

  • Planting 55 acres of native plant seed

  • Planting 50 trees and nearly 2,000 shrubs

  • Establishing 2 new acres of wetland habitat

  • Creating 18 acres of high-quality riparian habitat

  • Establishing a high functioning and more resilient stream corridor



East Plum Creek Restoration Partnership

Click for more information on the East Plum Creek Restoration Partnership.

The Douglas County Conservation District received a $19,935.00 grant from the Colorado Healthy Rivers Fund for the East Plum Creek Restoration Partnership (EPCRP) located at the Colorado Agricultural Leadership Foundation’s (CALF) Historic Lowell Ranch in southern Castle Rock, Douglas County. CALF owns the 168-acre property, and the entire stream restoration project is approximately a 1-mile long riparian corridor containing East Plum Creek. The property has a conservation easement held by Douglas Land Conservancy in perpetuity. This project is an important link to reduce the fragmentation and connect a variety of protected habitats both upstream and downstream of the project. The District in collaboration with project sponsors will work with contractors to continue the successful restoration practices implemented, which include more economical and less disruptive bank-focused lay back and stabilization methods to address bank wasting and the incised channel at the East Plum Creek Restoration Partnership. Once completed a breeding habitat will be created for waterfowl and improved habitat for a variety of Priority Wildlife Species, including beaver with the implementation of diverse plantings, woody debris and drop structures. The habitat improvement for native aquatic invertebrates, fish and amphibians will be specifically targeted as well. This project is an important link to reduce fragmentation and connect a variety of protected habitats both upstream and downstream of the project within this important wildlife corridor.

Sugar Creek Offsite Mitigation Project

Sugar Creek project is located 19 miles upstream of the Reservoir along 4.5 miles of Douglas County South Hwy 67 (Sugar Creek) within the Pike National Forest. Douglas County took over maintenance of the Sugar Creek Rd. improvements from the Chatfield Mitigation Company in August of 2022. Douglas County subsequently worked with a contractor to perform maintenance on the sediment traps which are a unique component of the Sugar Creek sediment transport mitigation infrastructure. Over 50 cubic yards of sediment were removed from 34 sediment traps.

Craig & Gould North Infrastructure Improvement Project

In collaboration with the Authority, Castle Rock Water is managing several current and proposed drainageway improvements along East and West Plum Creek. These projects enhance and, in some cases, reconstruct the natural floodplains in the Town of Castle Rock. This infrastructure serves to reduce public risk from stream channel erosion and flooding. These projects also have a water quality component that ensures our renewable drinking water supplies are preserved and protected.

The objectives of the Project were to add storm sewer within the public right-of-way to capture stormwater runoff, replace aging water and sewer infrastructure and upgrade the streets to current residential standards for safety. This includes two travel lanes on all residential streets, parking lanes, curb, gutter and sidewalks throughout the majority of the project. Existing alleyways that remained dirt up to this point were paved with concrete. In order to convey stormwater runoff, an outfall system was needed crossing the railroad. This outfall includes an underground water quality chamber to remove pollutants prior to discharging to East Plum Creek.

Construction began in November 2021 and will be completed no later than August 2023. JBS Pipeline, LLC was contracted by the Town to construct the project. Funding is provided by Castle Rock Water and Public Works, with a construction budget of $7.6 million. All properties within the project limits received new service line connections for water and sewer up to the property line. All water services were checked and determined not to have lead piping. Should this have been identified, lead piping services would have been replaced up to the house.

Omni Tributary: Prairie Hawk Drive to Red Hawk Drive

This project consisted of Stormwater Master Plan improvements for the Omni Tributary drainageway between Prairie Hawk Drive and Red Hawk Drive to repair damage to the channel as a result of development runoff, reduce flood risk to adjacent residential properties, decrease sediment transport downstream, and prevent further loss of existing vegetation and trees to the maximum extent possible. Additional channel stabilization measures are also included along the nearby Unnamed Tributary adjacent to Red Hawk Ridge Golf Course Hole No. 6.

Drainageway improvements on Omni Tributary consisted of importing and placing approximately 2,000 CY of fill material and 2,470 CY of topsoil, construction of five grouted boulder drop structures, and installation of riprap at various locations for culvert outlet protection and bank stabilization. Additionally, seven deciduous and fifteen evergreen trees will be planted at the end of the project to offset some of those lost during construction.

On Unnamed Tributary the scope of work is similar, with construction of one grouted boulder drop structure, riprap installed for bank stabilization and a steel sheet pile cutoff wall added to control the channel slope. Additionally, an existing triple 30” corrugated metal pipe crossing of a neighborhood paved trail was replaced with reinforced concrete pipe and new metal handrails for safety, and an existing raw water line crossing the channel was protected by raising the invert to provide more cover.

The contractor was 53 Corporation, LLC. The cost was $1,345,275, and the project was completed under budget. The project was completed in October 2022.

Colorado School of Mines Civil and Environmental Engineering Department Field Session

The Colorado School of Mines Civil and Environmental Engineering Department Field Session activities took place during the time period from May 16, 2022, through June 3, 2022. During the Environmental Field Session for 2022, students collected water quality data for the Chatfield Watershed Authority in order to determine whether surface water bodies such as streams and lakes meet the requirements set forth by the Colorado Department of Public Health and Environment (CDPHE). This field session is conducted like a real-life consulting project in which the Colorado School of Mines students serve as the environmental consultants delivering assessments on projects for the Chatfield Watershed Authority. Objectives were developed to be met for each of the six study sites identified for the field session. There were overall objectives for the session and site-specific objectives for each field location.

  1. East Plum Creek - Key Findings and Recommendations

  2. West Plum Creek and Tributaries - Key Findings and Recommendations

  3. I-25 (East Plum Creek along I-25) - Key Findings and Recommendations

  4. Sellers Gulch - Key Findings and Recommendations

  5. Sterling Gulch & Willow Creek - Key Findings and Recommendations

  6. Deer Creek - Key Findings and Recommendations

OBJECTIVES

1.Determine if there are any exceedances of Colorado 303 regulatory limits at study sites. Special emphasis given to arsenic, phosphorous, selenium, and E. coli.

2.Note the surrounding land uses (via field observation and investigations in Google Earth) and identify the potential for those land uses to contribute to water quality impairment.

3.Note and investigate any curious structures, operations, or formations near your study sites.

4.If illicit drainages are found, fill out an assessment sheet on the feature and if possible, perform water collection.

5.Investigate the local geology in the area to see if any formation outcrops could be contributing contaminants to receiving waters.

6.Evaluate and sample eroded streambanks and sediments, and perform leaching studies to determine what constituents of concern may be released from sediments during a flood event.

7.Where no water present, sample and test the sediments in the dry streambed for indications of what would be in the water if it were present.

8.For the snapshot period of the morning of May 20th, measure flow rates and compute contaminant loadings. Emphasis on loadings will be given to arsenic, selenium, phosphorous, and suspended solids.

West Plum Creek Stream Management Plan

Click image to access the draft report.

 

West Plum Creek is the last relatively unaltered transition zone stream in the area and is home to several important plains fish species. The resident fish in West Plum Creek are the only surviving relicts of declining plains species native to the South Platte and Arkansas River basins. Colorado Parks and Wildlife, alongside partners including US Fish and Wildlife Service, Douglas County Open Space, Chatfield Watershed Authority, and River Network, support an effort to study and assess aquatic and riparian habitat, as well as better understand hydrology and opportunities in water management with the water users. The end goal is to implement conservation actions that a diverse stakeholder group can support to help protect these fish (e.g., improving fish passage, enhancing water quality, and supporting healthy riparian conditions, as well as exploring potential opportunities for water management and flow protection).

Chatfield Storage Reallocation Project

In addition to flood control, Chatfield Reservoir recently added drinking water storage to its purpose. With the growing demand for water in Colorado’s Front Range and northeast Colorado farms, the U.S. Army Corps of Engineers (Corps) approved expanding the reservoir by 20,600 acre-feet for drinking water. The Chatfield Storage Reallocation Project, completed in 2019, required modifications for the recreational components of the park and environmental mitigation to restore and enhance the wildlife habitat.The Authority is currently monitoring water quality data and analyzing the changes occurring from additional water flow through the watershed and into the reservoir. 

Plum Creek Streambank Stabilization

In collaboration with the Authority, Castle Rock Water is managing several current and proposed drainageway improvements along East and West Plum Creek. These projects enhance and, in some cases, reconstruct the natural floodplains in the Town of Castle Rock. This infrastructure serves to reduce public risk from stream channel erosion and flooding. These projects also have a water quality component that ensures our renewable drinking water supplies are preserved and protected.