Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteClimate change can alter Great Plains river flows by changing precipitation, snowmelt, temperature, and evapotranspiration. Wetlands store and exchange water with rivers, groundwater, and the atmosphere, so losing them can alter local water storage and flow timing. Neither effect is uniform across the region: outcomes depend on the basin, season, wetland type, and the flow measure being considered. Available evidence does not establish one region-wide estimate of how wetland loss changes Great Plains river flows.
How does climate change affect river flows in the Great Plains?
River flow depends on both water supply and water loss. Precipitation and snowmelt add water; evapotranspiration removes it. Groundwater exchange, water withdrawals and returns, land cover, and basin characteristics also affect the amount and timing measured in a river. The U.S. Geological Survey’s 2025 national synthesis emphasizes that streamflow trends vary widely because these factors differ from basin to basin.
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That means heavier precipitation does not automatically produce a predictable increase in river flow. How much runs off depends on the storm’s duration and extent, soil saturation beforehand, land use and cover, and the shape and geology of the basin. Climate projections should therefore be read as conditional and place-specific, not as a forecast that every Great Plains river will rise or fall in the same way.
The region has distinct climate patterns
| Area | Reported climate pattern | Why it matters for river flow |
|---|---|---|
| Northern Great Plains | The U.S. Environmental Protection Agency’s 2024 summary of Fifth National Climate Assessment findings identifies drought, floods, and wildfires among climate-driven extremes. The USGS national synthesis reports projected substantial winter and spring precipitation increases for the Northern Great Plains, Upper Midwest, and Northeast. | More precipitation in some seasons does not by itself determine runoff; snowmelt, soil conditions, basin features, and land cover affect the response. |
| Southern Great Plains | The EPA’s 2024 summary reports that annual average temperature rose 1.5°F in Texas and Kansas and 0.6°F in Oklahoma from 1900 to 2020. Annual precipitation increased across most of the region except far west Texas. Days with at least 2 inches of precipitation became more frequent, with larger increases in the eastern half. | Warming and heavier precipitation can affect water entering and leaving rivers, but the east-west differences mean a single regional flow response should not be assumed. |
The Great Plains also has an east-to-west gradient of increasing elevation and decreasing precipitation, as described in the EPA summary. A historical 2004 study of ten watersheds in Nebraska, Kansas, and Oklahoma found that an upward precipitation trend in the final two decades of the twentieth century strongly affected streamflow, with a comparatively weaker effect on evapotranspiration. The amounts differed among watersheds, so this is evidence of period-specific sensitivity, not a universal relationship or a current forecast.
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What do wetlands do in a river basin?
A wetland’s water budget includes precipitation and surface-water and groundwater inflows, balanced against evapotranspiration, surface-water and groundwater outflows, and changes in stored water. USGS descriptions show why wetland location and connection to rivers and groundwater matter:
| Wetland type | Common water inputs | Common water losses or exchanges |
|---|---|---|
| Isolated prairie pothole | Direct precipitation and runoff from surrounding uplands; groundwater may also contribute. | Evapotranspiration and seepage; during wet periods, water may overflow. |
| River floodplain wetland | Precipitation and runoff; commonly groundwater; river water when high flows inundate the floodplain. | Evapotranspiration and groundwater exchange; floodwater may drain back as river levels recede. |
Because wetlands hold water and exchange it with other parts of a basin, removing one removes a place where storage and exchange occurred. But the consequences for river flow depend on how the wetland was connected to the river and groundwater, along with soils, season, and local conditions.
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How does wetland loss affect flooding and river flow?
The effect depends on which flow characteristic is being assessed. A change in peak flow during a storm is not the same as a change in low flow, seasonal timing, or total annual volume. The hydrology sources establish that wetlands store and exchange water, but they do not support a blanket claim that losing wetlands always increases floods, lowers baseflow, or reduces annual river flow across the Great Plains.
- Peak flows: A wetland’s role depends on whether it can receive and store water from the relevant event. Its effect cannot be inferred from the word “wetland” alone.
- Low flows and baseflow: Groundwater connections and seepage may matter, but the direction and size of a change after wetland loss are not established for the whole region.
- Seasonal timing and annual volume: Storage, overflow, evapotranspiration, and exchanges with rivers and groundwater can affect these measures differently. A conclusion about one metric should not be generalized to the others.
For a defensible local assessment, specify the wetland type, its basin and groundwater connections, the season, and the flow metric. The reviewed evidence does not provide a single quantitative causal estimate linking wetland loss to Great Plains river-flow changes.
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What has been observed, and what is projected?
Prairie pothole projections
A 2015 USGS review by David A. Renton, David M. Mushet, and Edward S. DeKeyser reports that hydrologic-model projections for prairie pothole wetlands generally forecast lower water levels and longer dry periods, even with potential increases in precipitation. The authors caution that natural variability in climate and wetland hydrology is high. They also note that recent precipitation increases in much of the Prairie Pothole Region raised wetland water inputs above losses associated with warmer temperatures, but those increases were within natural variability and might not persist. These projections concern prairie pothole wetlands; they are not a forecast for all Great Plains rivers.
A regional observation in the southern Prairie Pothole Region
A USGS publication reports that since 1993 a shift in precipitation regime corresponded with increases in pond numbers and depths, lake levels, stream flows, groundwater heights, and soil moisture in the southern Prairie Pothole Region. The publication also reports increased installation of subsurface tile drains in agricultural fields. This is a regional observed pattern, not a controlled estimate of the effect of wetland loss, and it should not be generalized to all Great Plains wetlands.
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How to check a river-flow trend without confusing it with its cause
The USGS Surface Water Flow Trends tool reports 18 streamflow metrics for fixed periods 1980–2020, 1990–2020, and 2000–2020, as well as each site’s longest possible record. A trend in a station’s record can show what changed for a particular metric and period; it cannot, by itself, identify whether climate change, wetland loss, withdrawals, regulation, or other land-use changes caused that trend.
Quick Recap
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- Choose a stream-gaging site in the basin you want to understand and identify the metric of interest, such as a peak-flow, low-flow, or seasonal measure.
- Compare the available fixed-period results with the site’s longest-record result. Different periods can show different patterns, so keep the time window attached to any reported trend.
- Interpret the trend alongside local precipitation, snowmelt, evapotranspiration, groundwater, water use, land cover, and wetland connectivity. The trend alone does not separate those influences.
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