The Upper Piedras Marcadas (UPM) Watershed is bounded by Universe Boulevard to the west, Paseo del Norte Boulevard and Avenida de Jaimito to the south, the Petroglyph National Monument to the east and roughly Paradise Boulevard to the north. It drains to the Piedras Marcadas Dam, which has a manually-operated gated outlet (normally closed). Discharges out of the dam must be coordinated with the MRGCD. In 1993, AMAFCA identified that the Piedras Marcadas Dam had limited volume for the entire upstream watershed, and diversions were planned, and subsequently implemented with the Ventana Ranch development to the Calabacillas, and the Trails development to the Boca Negra Dam.

Since 1993, development in the Piedras Marcadas Dam basin has followed City of Albuquerque and Bernalillo County criteria including the requirement to divert flows out of the basin into adjacent watersheds.  In 2013, AMAFCA initiated the Upper Piedras Marcadas Watershed Drainage and Water Quality Management Plan (UPMDMP) to complete a comprehensive analysis of completed infrastructure and diversions and to identify needed infrastructure to address runoff from new development to protect the Piedras Marcadas Dam.  The Plan identified sub-basins that could be diverted to adjacent watersheds and manage flows that continued to the Dam. Four alternatives were developed in order to provide property owners opportunities and options to construct required infrastructure to drain new developments that protected downstream infrastructure. The alternatives include diversions to the Calabacillas Arroyo, the Boca Negra Dam, or the Mariposa Dam. The remainder of the runoff including peak discharge and volumetric runoff can be controlled through detention ponds constructed within the undeveloped watershed.

The quality of runoff discharging to the Rio Grande is important and needs to be addressed, therefore, the Plan provides examples of on-site facilities that should be considered in the design of each project within the boundaries of the basin to improve stormwater quality.

Files for download:

File Size
Volume 1 Literature Review 103,206 kb
Volume 2 Existing Conditions Report 64,236 kb
Volume 3 Developed Conditions Report 59,118 kb