River Runs Kayaking Whitewater

The Gnar Section of the South Platte River in Colorado offers a thrilling and challenging whitewater experience. The section is rated as Class IV and includes several challenging rapids, such as Widowmaker, Staircase, and Two Step. The best time to float this section is during the spring runoff, typically between May and June, with recommended CFS levels of 600-800. It is important to note that this section contains several river obstacles such as rocks, drops, and steep chutes, so it is recommended to have advanced whitewater experience and proper safety gear. Overall, the Gnar Section is a must-do for experienced whitewater enthusiasts seeking an exhilarating adventure.

Realtime River Levels

South Platte River At South Platte
USGS 06707500
snowpack density image
Air Quality Alert
Until 2024-07-21T00:00:00-06:00 National Weather Service
The Colorado Department of Public Health and Environment has issued the following... WHAT...Ozone Action Day Alert. WHERE...Douglas, Jefferson, Denver, western Arapahoe, western Adams, Broomfield, Boulder, Larimer, and Weld Counties WHEN...400 PM Saturday July 20 to 1200 AM Sunday July 21 IMPACTS...Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Request to limit driving gas and diesel- powered vehicles is now in effect until midnight, Saturday night, July 20, 2024. Increased levels of ozone remain possible on Saturday for locations in and near Denver, particularly in the southern and western portions of the metro area. Cooler temperatures with clouds and showers will keep ozone concentrations in the Good to Moderate range on Sunday. For areas included in this advisory that are not expected to reach the Unhealthy for Sensitive Groups (USG) air quality designation, we request that activities, such as driving non-ZEV vehicles (i.e., gas or diesel), be reduced to lessen the impacts on neighboring air quality. Additional air pollution in this region may directly worsen air quality or contribute to precursors which may also adversely affect air quality. For Colorado air quality conditions, forecasts and advisories, visit: HEALTH INFORMATION...Increasing likelihood of respiratory symptoms and breathing discomfort in active children and adults and people with lung disease, such as asthma. Active children and adults, and people with lung disease, such as asthma, should reduce prolonged or heavy outdoor exertion.

July 20, 2024







Last Updated 2023-06-13
River Levels 405 cfs (2.89 ft)
Percent of Normal 101%
Optimal Range 200-700 cfs
Status Too High
Class Level V+
Elevation 6,094 ft
Run Length 1.0 Mi
Streamflow Discharge 604 cfs
Gauge Height 3.3 ft
Reporting Streamgage South Platte River At South Platte
USGS 06707500

Regional Streamflow


Cubic Feet Per Second


Cubic Feet Per Second


Cubic Feet Per Second


Cubic Feet Per Second

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