How it works
Four decisions, one yearly calendar, and a map drawn along rivers instead of roads. Once those hold still, every meeting, acronym, and grant deadline in Colorado snaps into a place you already understand.
4 min read
Honestly measured. Every acronym is spelled out the moment it first appears, so there are no glossary trips required.
Part one
Colorado plans water along nine basins, not its 64 counties. Basins follow the natural divides between river systems, the ridgelines water can’t cross. A basin line runs along a mountain crest. A county line runs wherever a surveyor drew it. They rarely agree, and that mismatch is the thing almost everyone new to this misses.
It matters because every plan, grant, and roundtable seat in this system is assigned by basin. A city that spans two basins answers to two different roundtables for its water supply, even though it’s one city council.
A real example
Aurora Water serves one city, but its supply is stitched together across four basins (Metro, South Platte, Colorado, and Arkansas) because the rivers its pipes reach don’t care where the city limits are.
9
Water planning basins
64
Colorado counties
Nine basins. Not one county line in sight.
Part two
Same four questions as the front page. Here’s what actually happens at each one, and exactly who does it in Colorado.
Applies everywhere
Colorado runs on prior appropriation: "first in time, first in right." Every water right carries a priority date set by a water court. In a dry year, the Division of Water Resources (DWR, the state engineer's office) enforces a "call": senior rights are filled in full before junior rights get anything, headgate by headgate down the river.
Who does it here
Keeps the water-rights ledger and enforces calls, statewide.
In Colorado
Colorado splits water planning into nine basin roundtables, one per river system. Each writes its own plan for supply gaps, healthy rivers, and agriculture, then feeds it into the statewide Colorado Water Plan, assembled by the Colorado Water Conservation Board (CWCB).
Who does it here
Meets in public; sets Colorado's water priorities.
Assembles all nine plans into one statewide plan.
Mostly statewide
Most local water and river projects run on a short list of state grant programs, matched with local money: the Water Supply Reserve Fund, the Colorado Water Plan Grant Program, and others. Several require the local basin roundtable to sign off before the state evaluates the request.
Who does it here
Runs the grant programs that fund most local projects.
Approves requests from Colorado before the state funds them.
In Colorado
Watershed groups, conservancy districts, municipal utilities, and volunteers do the physical work: restoring streams, monitoring water quality, fixing headgates, and running the public education that keeps the rest of this system informed.
Who does it here
Runs monitoring, restoration, and volunteer programs here.
Part three
This is what makes the system feel alive rather than bureaucratic: it runs on a calendar, and the calendar repeats.
Winter
Oct – Mar
The Natural Resources Conservation Service (NRCS) Colorado, with the Division of Water Resources as an official cooperator, walks the same mountain snow courses every year. That reading is the number every forecast for the rest of the year starts from.
Watch for: Snow-water equivalent readings, published as a percent of normal for each basin.
Who acts
Spring
Apr – May
Snowpack numbers convert into a runoff forecast: how full reservoirs will get, and how much water is coming down each river this year.
Watch for: Reservoir fill projections and spring runoff outlooks.
Who acts
Summer
Jun – Aug
In a dry year, senior water-rights holders who aren't getting their full decreed amount ask the state to shut off junior users upstream. Water commissioners enforce it headgate by headgate.
Watch for: Call notices posted by division; which priority dates are being curtailed.
Who acts
Summer
Jun – Aug
Cities and irrigators draw the most water of the year at the same time flows are lowest. Utilities and ditch companies manage watering restrictions and delivery schedules.
Watch for: Local watering-restriction announcements.
Who acts
Fall
Sep – Nov
The state's nine basin roundtables scores that basin's Water Supply Reserve Fund applications before the state evaluates a single one, the local sign-off this system runs on.
Watch for: Roundtable meeting agendas and project score sheets.
Who acts
Winter
Dec – Jan
The Public Education, Participation, and Outreach (PEPO) grant program closes applications June 1 and December 1 each year; other CWCB cycles turn over around the same time, right as next year's snow survey begins.
Watch for: CWCB grant deadlines.
Who acts
Meetings, volunteer days, newsletters, and grant deadlines for Colorado: five ways in, already open.