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The Montoyas Arroyo Sportsplex Dam

Keeping Growing Communities Safe: Montoyas Arroyo Sportsplex Dam
The Montoyas Sportsplex Dam is the largest dam the Southern Sandoval County Arroyo Flood Control Authority (SSCAFCA) has constructed to date. The Sportsplex Dam was designed and constructed through a partnering effort among SSCAFCA, the City of Rio Rancho, and Pulte Homes. Bohannan Huston, Inc. (BHI) was selected by SSCAFCA to tackle the unique engineering challenge of designing a dam that provided the essential drainage functionality, uses “naturalistic” land form concepts, provides for future expansion of the adjacent Rio Rancho Sports Complex, and has multi-use elements, including biking and walking trails for the general public. The dam also serves as the entryway to Pulte Homes’ Loma Colorado community, with a two-lane, gently curved road complemented by rich landscaping that adds to the site’s ambience. 

  • Providing a water quality facility. The initial upstream entrance to the dam has a water quality pond that captures the “first flush” of contaminants from flood waters in the Montoyas Arroyo.
  • Designing a concrete spillway that doubles as the south bound lane of the Loma Colorado entryway. This “hardened” spillway protects the dam from severe events that overtop the dam such as the Probable Maximum Flood (PMF). 
  • Obtaining the necessary approvals from the Office of the State Engineer and the Corps of Engineers.
  • Realigning the existing sewer line out of the bottom of the arroyo and placing it safely through the concrete dam scour protection wall.
  • Conducting archeological and endangered species studies.
  • Varying grading to create a more natural-looking land form in the flood pool.
  • Providing expansion opportunities for the adjacent Rio Rancho Sports Complex.
  • Leaving excess earth in the flood pool so that SSCAFCA could later sell the earth rather than paying to have it removed.

Facts and Figures
Dam storage: 312 acre-feet
Outflow: 4,300 cubic feet per second
Public open space: 27 acres, including a ¾-mile pedestrian trail
Cost: $4.7 million. Funding was provided through SSCAFCA bonds, SSCAFCA general funds, and contributions by the City of Rio Rancho and Pulte Homes.
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Bohannan Huston provides civil engineering, spatial data, laser scanning, and related advanced technology services. We service organizations in Albuquerque and Las Cruces, New Mexico, Dallas, Texas and Denver, Colorado.