In Jeffco, drainageways need to stay open

That unremarkable ditch, swale, or low spot on a Jeffco lot is usually doing real work, carrying storm runoff somewhere it needs to go.

Because of that, the rule is firm: you may not impede or interfere with stormwater flow in natural drainageways, unimproved channels, watercourses, or improved ditches and canals in a way that causes flooding where it would not otherwise happen. The block does not have to be a deliberate dam. Debris, branches, and other material left in the path count just as much.

The trouble tends to arrive quietly, in the weeks after a storm, some tree work, a new fence, a landscaping project, or a reshaped driveway. A pile of brush or a load of fill that looks harmless sitting on your own lot can nudge water sideways, sending it toward a county road or straight into a neighbor’s yard. The damage shows up on someone else’s property, and so can the responsibility for it.

The calm way to stay clear of all that: treat any drainageway crossing your land as shared infrastructure rather than yard you fully control. Before you change a flow path, fill a low spot, or leave material where stormwater is meant to move, run the plan past Planning and Zoning first. The county’s Floodplain Management office can tell you whether what you have in mind crosses the line.