Project History and Need

  • 2008 Hurricane Dolly caused extensive flooding in the Village of Ruidoso that damaged critical infrastructure, including the existing wastewater interceptor.
  • 2008-2009 emergency repairs fixed the worst damaged segments, but the interceptor crosses and runs in close proximity to the Rio Ruidoso in many locations.
  • 2009 Wilson and Company completed a Preliminary Engineering Report (PER) comparing various alternatives for addressing the vulnerability of the interceptor. The recommended project relocated the interceptor to Main Road in the Upper Canyon.
  • 2010 Zia Engineering and Environmental completed an Environmental Assessment (EA) of the 2009 PER and reiterated that the preferred project alternative was to relocate the interceptor away from the Rio Ruidoso. A Finding of No Significant Impact (FONSI) was issued by FEMA in 2010 and the project was environmentally cleared to proceed.
  • Around 2011, CH2MHill contracted to develop a 30% design based on the findings of the PER, EA and FONSI.
  • 2012 - 2014 CH2MHill conducts extensive field work to investigate field conditions and develop the 30% Design. Preliminary construction cost opinions developed by CH2MHill estimated the cost of the project to be approximately $60 million. Project placed on hold pending further review by FEMA.
  • 2016 FEMA agrees to a project budget, including costs shared by the State of New Mexico and Village of Ruidoso.
  • 2017 Molzen Corbin hired to evaluate the 30% Design and revise the scope to be more affordable and within the scope of FEMA Public Assistance Grant requirements.
  • May 2018 Molzen Corbin completes 30% Design evaluation and recommends value engineered project consisting of primarily repair and rehabilitation of the existing sewer line with additional in-river improvements designed to protect the sewer line from flood hazards. Design of the recommended project is underway.


The existing interceptor is located in close proximity to the Rio Ruidoso, which presents the following challenges:

  • Accessibility to interceptor for construction activities
  • High ground water
  • Prevalence of rock in underlying soils
  • River channelization has increased flood hazards and degraded the river channel


  • Potential reduction in infiltration and inflow into the collection system
  • Extension of the useful service life of the collection system
  • Prevention of damage to the interceptor from future flood events
  • Improved flow mechanics through interceptor


Estimated Design Completion: December 2018
Estimated Permitting Requirements: 4 to 6 months (to occur in conjunction with design)
Estimated Construction Duration: 12-15 months
Estimated Construction Completion Date: June 2020