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County installs sediment catchment basins after engineer says no easy fix for Surprise Drive washouts
Summary
San Miguel County hired an engineer to analyze recurring drainage and washout problems on Surprise Drive; staff said a full engineered solution would require condemning properties or major culvert work, so the county installed interim catchment basins and will monitor and maintain them while exploring longer-term options with CDOT and neighbors.
County staff presented the results of an engineer’s study on recurring stormwater washouts affecting Surprise Drive and adjacent properties and described a pragmatic, interim approach to reduce runoff and sediment transport.
Staff said the engineer concluded there is no low-cost, guaranteed long-term fix without significant property acquisition or major infrastructure changes that would redirect historic flows; one CDOT alternative to upsize a culvert across the highway was estimated at roughly $500,000 for the state portion alone, with additional county culvert upsizing required upstream. Faced with those costs and uncertainty, staff reported crews installed catchment basins and slow-the-flow measures last fall and monitoring after a recent rain event showed improved performance in reducing sediment and debris reaching the road.
Why it matters: property owners told the county they have experienced repeated property damage and sediment flows from the wash. Residents asked for county help to reduce damage to homes and driveways. County staff said private property owners have also installed berms and other defenses, which carries potential civil-liability complications if the county redirects water.
Staff said the interim measures will require ongoing maintenance and cleaning to avoid sediment fill; they will continue to monitor results and coordinate with CDOT, which proposed other alternatives including a large French drain rather than an upsized culvert. Staff also noted driveway culverts on private property are the property owners’ responsibility; if homeowners rebuild driveways or alter grades, the county will require compliance with today’s drainage/grading standards.
Ending: County staff asked property owners to document damage and coordinate with county staff so officials can consider incentives or targeted repair assistance as part of budget or grant planning, while cautioning that major structural solutions will be costly and might require property acquisitions or long-term engineering projects.
