The Vote That Kept the South Platte Wild Through Littleton

Walk the Mary Carter Greenway Trail on a cool October morning and the river does something rivers rarely get to do this close to a metro area of three million people: it bends. It braids around gravel bars. It slows into backwaters where herons stand motionless for minutes at a time. No concrete channel forces it in a straight line toward the confluence with the Platte's other tributaries. For 880 acres, from the edge of Old Town Littleton south toward Chatfield Reservoir, the South Platte River is allowed to behave like a river.

That is not an accident of terrain. It is the direct result of a decision Littleton residents made six decades ago, after the river did the opposite of what anyone wanted.

What the 1965 Flood Left Behind

In June 1965, catastrophic flooding along the South Platte and Plum Creek tore through the area, and the standard engineering answer at the time was the one the Army Corps of Engineers had already drawn up: straighten the river, line it with concrete, force it into a predictable channel so it could never again spread across the floodplain the way it just had. That is what happened to long stretches of urban rivers across the country in the decades that followed.

Littleton residents voted for something else. Rather than accept a channelized river, the city taxed itself to buy the floodplain outright and preserve it as permanent open space, a choice that ran against the engineering consensus of the era and set a new precedent for flood control at the time. The park that resulted, South Platte Park, was established in 1983, and it protects what is now the only unchannelized stretch of the South Platte River anywhere in the Denver metro area.

That single fact explains almost everything about how the park looks and feels today. The river gets to move. The floodplain gets to flood, on its own schedule, into land the city deliberately kept undeveloped rather than let it become another subdivision or another parking lot. Walking the trail here is not a walk through leftover land. It is a walk through a piece of infrastructure that residents chose, one that happens to double as 880 acres of open space along the water.

Lakes That Used to Be Gravel Pits

The five lakes inside South Platte Park did not form naturally either. Before the park existed, the floodplain spent more than three decades as a gravel mining operation, and the pits left behind were reshaped into the lakes that anchor the park today. Restoration work turned mining scars into habitat, and the lakes are now open to fishing for smallmouth bass and trout.

The lakes visible along the paved Greenway as it runs between the nature center and Chatfield Reservoir include:

• Cooley Lake, one of the largest, visible from the main trail corridor near the nature center
• Eaglewatch Lake, named for the bald eagles that show up in winter and shoulder-season birdwatching reports
• Redtail Lake, part of the stretch of trail that winds directly between the lakes rather than around them
• Blackrock Lake, the fourth of the group along that same corridor
• South Platte Reservoir, the largest of the five and the one most visible from the greenway's northern approach

Anyone planning to fish any of them needs a valid Colorado fishing license, the same requirement that applies statewide and is enforced through Colorado Parks and Wildlife.

The Building With the Flood Inside It

The Carson Nature Center sits at 3000 W. Carson Dr., inside the park itself, and it functions as the interpretive core of the whole 880 acres. Its centerpiece exhibit is an interactive sand and water table built to recreate the 1965 flood, the same event that created the park in the first place. Kids who visit on school field trips get their hands wet running the model; adults tend to find it more useful than they expect for understanding why the trail outside doesn't look like a typical suburban greenway.

Staff are professionally certified through the National Association for Interpretation, and the programming runs year-round: guided family walks, campfire programs, youth camps, and wildlife-watching sessions built around the park's more than 300 recorded species, from beavers working the banks to great blue herons and belted kingfishers along the water. General admission to the nature center is free. Specific programs, especially the guided walks and camps, sometimes carry a fee or require registration ahead of time.

Here's what a visit actually looks like on the ground:

That last line matters more than it looks. South Platte Park is not unmanaged wilderness that happened to survive next to a growing suburb. It is a maintained, day-use, flood-control landscape that the South Suburban Parks and Recreation District actively operates, with rules that keep the wild parts wild on purpose rather than by neglect.

A Trail That Actually Goes Somewhere

The Mary Carter Greenway Trail is the spine that ties the park to the rest of Littleton's daily geography, and it does more work than a typical nature trail. Paved and multi-use, it runs north-south along the river, and it connects the nature center directly to two very different destinations depending on which way you turn.

Head south and the trail continues toward Chatfield Reservoir. Head north and it eventually reaches into Denver, a long enough ride that most people treat it as a serious bike outing rather than an afternoon loop. Closer to home, the more common use is shorter: residents who live near the trail bike it directly into Old Town Littleton for lunch or a drink, treating the greenway less like a scenic detour and more like the most direct route between the river and Main Street.

There's also a transit connection worth knowing if you don't live within easy biking distance. The RTD D Line's Mineral Station sits close enough that a rider can cross the pedestrian bridge over Santa Fe Avenue into the Mineral Park-n-Ride and pick up the greenway from there, turning a fall afternoon at the nature center into a car-free outing from almost anywhere along the light rail line.

None of this is incidental to what the park is. A river that was allowed to keep bending, lakes rebuilt out of old gravel pits, a nature center built around the flood that started it all, and a trail that connects all of it to both a state park and a transit line: that's not a collection of amenities. It's the shape a specific 1960s decision took once it had sixty years to grow into.

The park closes to overnight use every night and reopens every morning, the same 880 acres it has protected since 1983, the same unchannelized stretch of river running through the middle of a city that voted, once, to let it.

South Platte Park sits close to some of the same Littleton streets and floodplain-adjacent neighborhoods where buyers ask sharp questions about grading, drainage, and what a lot actually backs up to. If you're weighing a move near the greenway or anywhere else in the Littleton area, John Chrisbens can walk you through what that proximity means for a specific property, not just the trail map.

This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.