Archives: Projects

BC&A completed the design of a 15 MG buried, reinforced concrete, rectangular reservoir for CUWCD. The new reservoir is adjacent to the 10 MG Phase I NSTR, and includes yard piping, two valve vaults, connections to existing facilities, and extensive coordination to maintain service of existing facilities during construction.  The design also included extensive seismic evaluation of the existing 10 MG reservoir, as well as workshops to optimize yard piping design for maximum operational flexibility.  The design was completed in July 2021, and construction was completed in 2024.

On August 23, 2020, a summer thunderstorm moved into the St. George, Utah area and rain began to fall throughout the City of St. George (City) and neighboring cities. This intense rainfall event caused significant flooding in the urban areas of St. George City damaging homes, causing erosion to the waterways, and leaving a significant amount of sediment for the City to clean up. The Natural Resource Conservation Service (NRCS) contacted the City to provide funding through their Emergency Watershed Protection (EWP) Program to help mitigate the damages from this August 2020 storm event. Bowen Collins & Associates (BC&A) worked with the City and NRCS to identify four sites to construct flood mitigation and damage repairs for this St. George EWP Project. These sites/projects are identified as follows:

Site 1 – Virgin River Restoration – erosion bank protection along the Virgin River in Bloomington area of the City.

Site 2 – Middleton Floodwall – a new floodwall near the Middleton area of the City.

Site 3 – Red Hills Debris Basin – a new debris basin near the intersection of Hwy 18 and Red Hills Parkway.

Site 4 – Industrial Park Debris Basins – One new debris basin and improvements to existing basins in the St. George Industrial Park. This site is further subdivided as follows:

• North Industrial Park Debris Basin – a single 45.6 ac-ft debris basin constructed from an embankment placed on Rim Rock Wash in the northern portion of the St. George Industrial Park.
• South Industrial Park Debris Basin – improvements to two existing excavated debris basins located at the southern end of the St. George industrial Park, near the storage yard for the St. George City Water and Energy Services departments.

BC&A’s services on this project included environmental permitting and all required surveys, hydrologic and hydraulic design, structural design, and construction observation and management.

Bowen Collins & Associates led the planning, design, and construction period services for the Sevier Bridge Dam Rehabilitation Project. Owned and operated by the CSBR Company in Delta, Utah, the Sevier Bridge Dam has been impounding Sevier River water for over 120 years and is the largest privately-owned reservoir in Utah. The reservoir serves as the primary storage of irrigation water to sustain tens of thousands of acres of agricultural land and the cooling water required to operate the Intermountain Power Plant.
BC&A utilized advanced modeling software to identify that the dam’s spillway and earthen embankment were deficient in meeting minimum standards for flood and seismic events. This project entailed the design of a new roller gate spillway to resolve the flow capacity issues, and the innovative solution of utilizing granular columns to stabilize the downstream embankment toe, a technology new to dams in Utah. Most challenging, the technical construction effort had to be completed without interfering with the dam’s critical role of storing and delivering water to the lower Sevier River water users.
Culminating in a $22,000,000 construction project with Ames Construction, the project was delivered with less than 2.5% change orders despite surviving Utah’s wettest winter on record without wasting any spring runoff storage. The Sevier Bridge Dam Rehabilitation Project won the 2025 ACEC Utah Grand Conceptor Award and the Association of State Dam Safety Officials 2025 National Rehabilitation Project of the Year.

The DMAD Canal Company contracted Bowen Collins & Associates for the design planning, design, permitting, bidding, and construction period services for the Spillway Replacement Project on the DMAD Reservoir. The new design required spillway that was equipped to pass the probable maximum flood and constructed to resist future erosion with increased foundation stability. After multiple spillway configurations modeling iterations, an 8-cycle concrete labyrinth weir spillway was selected. This labyrinth configuration increased the effective weir length of the spillway to 1,200-ft contained within a 293-ft span. Hydraulic modeling of the new structure allowed BC&A to further optimize the spillway chute and stilling basin to ensure that the project’s flow capacity and stability requirements were met while keeping project costs down.

BC&A managed and designed the expansion of a one-acre plaza and concession area located east of the existing Sandy City Amphitheater. The new multi-level plaza creates inviting spaces for community gatherings and vendor activities, anchored by a modern concession building that complements the architectural style of the amphitheater. The design integrates retaining walls, ambient lighting, and an organic aesthetic with full ADA accessibility. As part of the project, the existing parking lot was retrofitted to include Low Impact Development (LID) landscape islands for stormwater retention, along with xeriscape design and water-wise plantings that enhance sustainability throughout the site.

Jordanelle Special Service District contracted with BC&A to perform the design of a new surface water treatment plant taking raw water from the Provo River just downstream of Jordanelle Reservoir. The design portion included the initial treatment evaluation study, water quality testing programs, 3 months of pilot testing, budgetary planning, preliminary design, and final design. The current phase of the project is to construct 4 MGD worth of treatment on the site using a conventional coagulation/ sedimentation and filtration treatment approach. Future phases will expand the capacity in this facility to 8 MGD, and eventually 16 MGD in a future building. This facility also includes the pumps, piping, and equipment to pump up to 10,000 gpm to a nearby ski resort for snowmaking operations. Construction on the project began in March 2022 and is scheduled to be completed in September 2024.