Rio Rancho, New Mexico's third-largest city, is filling another gap in the flood control network it has spent three decades scrambling to build after explosive suburban growth outpaced any serious stormwater planning.

The Southern Sandoval County Arroyo Flood Control Authority, known as SSCAFCA, has awarded a contract to improve the Lisbon Channel, extending it from the Arkansas Channel south to Southern Boulevard. The work will likely include widening, deepening, and lining the channel to safely carry monsoon floodwater through developed neighborhoods toward the Rio Grande. The winning contractor and contract amount have not been publicly disclosed.

The project reflects a problem that dates to the 1960s and 70s, when the AMREP Corporation sold tens of thousands of residential lots across the high-desert mesa west of Albuquerque, largely through mail-order marketing, with almost no infrastructure planning. As those lots built out over subsequent decades, rooftops, driveways, and roads dramatically increased runoff while the natural arroyo system was left to handle the load on its own.

By the time New Mexico's legislature created SSCAFCA in 1990 to address the problem, Rio Rancho already had roughly 32,000 residents. The city has since grown to more than 100,000, and the flood control district has been building retroactively ever since. The arroyos that lace the mesa terrain become dangerous flash-flood corridors during the summer monsoon season, when cloudbursts can dump inches of rain in minutes on saturated sandy soils.

SCAFCA funds its work through a property tax mill levy, development impact fees, and occasional state and federal grants. The agency has completed dozens of channel construction and improvement projects, including the Lomitas Negras Channel and Primary Drainage Network 7 improvements, but infrastructure needs have consistently outpaced revenue as new residential and commercial development continues to add impervious surface across the district.

The Lisbon Channel project is one more piece of that unfinished puzzle. With Rio Rancho continuing to approve new development, the pressure on SSCAFCA to close remaining gaps in the drainage network before the next monsoon season keeps growing.