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Causes for the decline of suspended-sediment discharge in the Mississippi River system, 1940–2007 Before 1900, the Missouri–Mississippi River system transported an estimated 400 million metric tons per year of sediment from the interior of the United States to coastal Louisiana. During the last two decades (1987–2006), this transport has averaged 145 million metric tons per year. The cause for this substantial decrease in sediment has been attributed to the trapping characteristics of dams constructed on the muddy part of the Missouri River during the 1950s. However, reexamination of more than 60 years of water- and sediment-discharge data indicates that the dams alone are not the sole cause. These dams trap about 100–150 million metric tons per year, which represent about half the decrease in sediment discharge... Categories: Publication; Types: Citation; Tags: Mississippi River, Missouri River, river engineering LTRM Water Quality Sampling Strata The data set includes delineation of sampling strata for the six study reaches of the UMRR Program’s LTRM element. Separate strata coverages exist for each of the three monitoring components (fish, vegetation, and water quality) to meet the differing sampling needs among components. Generally, the sampling strata consist of main channel, side channel, backwater, and impounded areas. The fish component further delineates a “shoreline” portion of the strata to be used for sampling gears deployed only along the shoreline. The data are raster in origin, with the center of each pixel representing the sampling location. Cell size is typically 50 meters, although several water quality strata are at 200 meter cell size. Categories: Data, Publication; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Mississippi River, Navgation Pool 13, Upper Mississippi River, aquatic areas, sampling strata LTRM Fish Sampling Strata The data set includes delineation of sampling strata for the six study reaches of the UMRR Program’s LTRM element. Separate strata coverages exist for each of the three monitoring components (fish, vegetation, and water quality) to meet the differing sampling needs among components. Generally, the sampling strata consist of main channel, side channel, backwater, and impounded areas. The fish component further delineates a “shoreline” portion of the strata to be used for sampling gears deployed only along the shoreline. The data are raster in origin, with the center of each pixel representing the sampling location. Cell size is typically 50 meters, although several water quality strata are at 200 meter cell size. Categories: Data, Publication; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Mississippi River, Navgation Pool 13, Navigation Pool 26, Upper Mississippi River, aquatic areas, All tags... sampling strata, Fewer tags UMRS Sail Line This coverage contains arcs representing the sailing line for the center of the navigation channel for the Upper Mississippi River, that is maintained by the Corps of Engineers. Categories: Data, Publication; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Mississippi River, Upper Mississippi River, navigation Regional-scale controls on dissolved nitrous oxide in the Upper Mississippi River The U.S. Corn Belt is one of the most intensive agricultural regions of the world and is drained by the Upper Mississippi River (UMR), which forms one of the largest drainage basins in the U.S. While the effects of agricultural nitrate (NO3−) on water quality in the UMR have been well documented, its impact on the production of nitrous oxide (N2O) has not been reported. Using a novel equilibration technique, we present the largest data set of freshwater dissolved N2O concentrations (0.7 to 6 times saturation) and examine the controls on its variability over a 350 km reach of the UMR. Driven by a supersaturated water column, the UMR was an important atmospheric N2O source (+68 mg N2O N m−2 yr−1) that varies nonlinearly... Categories: Publication; Types: Journal Citation; Tags: Dissolved nitrous oxide, Mississippi River Increasing streamflow and baseflow in Mississippi River since the 1940 s: Effect of land use change A trend of increasing streamflow has been observed in the Mississippi River (MR) basin since the 1940 s as a result of increased precipitation. Herein we show that increasing MR flow is mainly in its baseflow as a result of land use change and accompanying agricultural activities that occurred in the MR basin during the last 60 years. Agricultural land use change in the MR basin has affected the basin-scale hydrology: more precipitation is being routed into streams as baseflow than stormflow since 1940 s. We explain that the conversion of perennial vegetation to seasonal row crops, especially soybeans, in the basin since 1940 s may have reduced evapotranspiration, increased groundwater recharge, and thus increased... Categories: Publication; Types: Citation; Tags: Baseflow, Data Visualization & Tools, Land use change, Landscapes, Mississippi River, All tags... Northeast CASC, Other Landscapes, Science Tools For Managers, Streamflow, Fewer tags UMRR Pool 04 Topobathy Separate data for floodplain elevation and bathymetry were collected on the Upper Mississippi River System (UMRS) by the US Army Corps of Engineers (USACE), Upper Mississippi River Restoration (UMRR) program. While many information needs can be met by using these data separately, in many cases seamless elevation data across the river and its floodplain are needed. This seamless elevation surface was generated by merging lidar (i.e., floodplain elevation) and bathymetry data. Merging the data required special processing in the areas of transition between the two sources of data. Categories: Data, Publication; Types: Citation, Downloadable, GeoTIFF, Map Service, Raster; Tags: Minnesota, Mississippi River, Navigation Pool 03, Navigational Pool 04, Upper Mississippi River, All tags... Wisconsin, bathymetry, lidar, topobathy, Fewer tags UMRR Pool 09 Topobathy Separate data for floodplain elevation and bathymetry were collected on the Upper Mississippi River System (UMRS) by the US Army Corps of Engineers (USACE), Upper Mississippi River Restoration (UMRR) program. While many information needs can be met by using these data separately, in many cases seamless elevation data across the river and its floodplain are needed. This seamless elevation surface was generated by merging lidar (i.e., floodplain elevation) and bathymetry data. Merging the data required special processing in the areas of transition between the two sources of data. Categories: Data, Publication; Types: Citation, Downloadable, GeoTIFF, Map Service, Raster; Tags: Iowa, Minnesota, Mississippi River, Navigation Pool 03, Navigational Pool 09, All tags... Upper Mississippi River, Wisconsin, bathymetry, lidar, topobathy, Fewer tags UMRR Pool 05 Topobathy Separate data for floodplain elevation and bathymetry were collected on the Upper Mississippi River System (UMRS) by the US Army Corps of Engineers (USACE), Upper Mississippi River Restoration (UMRR) program. While many information needs can be met by using these data separately, in many cases seamless elevation data across the river and its floodplain are needed. This seamless elevation surface was generated by merging lidar (i.e., floodplain elevation) and bathymetry data. Merging the data required special processing in the areas of transition between the two sources of data. Categories: Data, Publication; Types: Citation, Downloadable, GeoTIFF, Map Service, Raster; Tags: Minnesota, Mississippi River, Navigation Pool 03, Navigational Pool 05, Upper Mississippi River, All tags... Wisconsin, bathymetry, lidar, topobathy, Fewer tags Water and Sediment Temperatures at Mussel Beds in the Upper Mississippi River Basin Abstract: Native freshwater mussels are in global decline and urgently need protection and conservation. Declines in the abundance and diversity of North American mussels have been attributed to human activities that cause pollution, waterquality degradation, and habitat destruction. Recent studies suggest that effects of climate change may also endanger native mussel assemblages, as many mussel species are living close to their upper thermal tolerances. Adult and juvenile mussels spend a large fraction of their lives burrowed into sediments of rivers and lakes. Our objective was to measure surface water and sediment temperatures at known mussel beds in the Upper Mississippi (UMR) and St. Croix (SCR) rivers to estimate... Categories: Publication; Types: Citation; Tags: Climate change, Mississippi River, National CASC, Other Wildlife, Wildlife and Plants, All tags... freshwater mussels, Fewer tags Causes for the decline of suspended-sediment discharge in the Mississippi River system, 1940–2007 Before 1900, the Missouri–Mississippi River system transported an estimated 400 million metric tons per year of sediment from the interior of the United States to coastal Louisiana. During the last two decades (1987–2006), this transport has averaged 145 million metric tons per year. The cause for this substantial decrease in sediment has been attributed to the trapping characteristics of dams constructed on the muddy part of the Missouri River during the 1950s. However, reexamination of more than 60 years of water- and sediment-discharge data indicates that the dams alone are not the sole cause. These dams trap about 100–150 million metric tons per year, which represent about half the decrease in sediment discharge... Categories: Publication; Types: Citation; Tags: Mississippi River, Missouri River, river engineering UMRR Pool 08 Topobathy Separate data for floodplain elevation and bathymetry were collected on the Upper Mississippi River System (UMRS) by the US Army Corps of Engineers (USACE), Upper Mississippi River Restoration (UMRR) program. While many information needs can be met by using these data separately, in many cases seamless elevation data across the river and its floodplain are needed. This seamless elevation surface was generated by merging lidar (i.e., floodplain elevation) and bathymetry data. Merging the data required special processing in the areas of transition between the two sources of data. Categories: Data, Publication; Types: Citation, Downloadable, GeoTIFF, Map Service, Raster; Tags: Minnesota, Mississippi River, Navigation Pool 03, Navigational Pool 08, Upper Mississippi River, All tags... Wisconsin, bathymetry, lidar, topobathy, Fewer tags Tritium hydrology of the Mississippi River basin In the early 1960s, the US Geological Survey began routinely analysing river water samples for tritium concentrations at locations within the Mississippi River basin. The sites included the main stem of the Mississippi River (at Luling Ferry, Louisiana), and three of its major tributaries, the Ohio River (at Markland Dam, Kentucky), the upper Missouri River (at Nebraska City, Nebraska) and the Arkansas River (near Van Buren, Arkansas). The measurements cover the period during the peak of the bomb-produced tritium transient when tritium concentrations in precipitation rose above natural levels by two to three orders of magnitude. Using measurements of tritium concentrations in precipitation, a tritium input function... Categories: Publication; Types: Citation; Tags: Isotopes, Mississippi River, Residence, radioactivity UMRR Pool 05a Topobathy Separate data for floodplain elevation and bathymetry were collected on the Upper Mississippi River System (UMRS) by the US Army Corps of Engineers (USACE), Upper Mississippi River Restoration (UMRR) program. While many information needs can be met by using these data separately, in many cases seamless elevation data across the river and its floodplain are needed. This seamless elevation surface was generated by merging lidar (i.e., floodplain elevation) and bathymetry data. Merging the data required special processing in the areas of transition between the two sources of data. Categories: Data, Publication; Types: Citation, Downloadable, GeoTIFF, Map Service, Raster; Tags: Minnesota, Mississippi River, Navigational Pool 05a, Upper Mississippi River, Wisconsin, All tags... bathymetry, lidar, topobathy, Fewer tags UMRR Pool 07 Topobathy Separate data for floodplain elevation and bathymetry were collected on the Upper Mississippi River System (UMRS) by the US Army Corps of Engineers (USACE), Upper Mississippi River Restoration (UMRR) program. While many information needs can be met by using these data separately, in many cases seamless elevation data across the river and its floodplain are needed. This seamless elevation surface was generated by merging lidar (i.e., floodplain elevation) and bathymetry data. Merging the data required special processing in the areas of transition between the two sources of data. Categories: Data, Publication; Types: Citation, Downloadable, GeoTIFF, Map Service, Raster; Tags: Minnesota, Mississippi River, Navigational Pool 07, Upper Mississippi River, Wisconsin, All tags... bathymetry, lidar, topobathy, Fewer tags LTRM Vegetation Sampling Strata The data set includes delineation of sampling strata for the six study reaches of the UMRR Program’s LTRM element. Separate strata coverages exist for each of the three monitoring components (fish, vegetation, and water quality) to meet the differing sampling needs among components. Generally, the sampling strata consist of main channel, side channel, backwater, and impounded areas. The fish component further delineates a “shoreline” portion of the strata to be used for sampling gears deployed only along the shoreline. The data are raster in origin, with the center of each pixel representing the sampling location. Cell size is typically 50 meters, although several water quality strata are at 200 meter cell size. Categories: Data, Publication; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Mississippi River, Navigation Pool 8, Upper Mississippi River, aquatic areas, sampling strata UMRR Pool 21 Topobathy Separate data for floodplain elevation and bathymetry were collected on the Upper Mississippi River System (UMRS) by the US Army Corps of Engineers (USACE), Upper Mississippi River Restoration (UMRR) program. While many information needs can be met by using these data separately, in many cases seamless elevation data across the river and its floodplain are needed. This seamless elevation surface was generated by merging lidar (i.e., floodplain elevation) and bathymetry data. Merging the data required special processing in the areas of transition between the two sources of data. Categories: Data, Publication; Types: Citation, Downloadable, GeoTIFF, Map Service, Raster; Tags: Illinois, Minnesota, Mississippi River, Missouri, Navigation Pool 03, All tags... Navigational Pool 21, Upper Mississippi River, Wisconsin, bathymetry, lidar, topobathy, Fewer tags Floodplain sedimentation in the Upper Mississippi Valley: Natural versus human accelerated Understanding the time scales and pathways for response and recovery of rivers and floodplains to episodic changes in erosion and sedimentation has been a long standing issue in fluvial geomorphology. Floodplains are an important component of watershed systems because they affect downstream storage and delivery of overbank flood waters, and they also serve as sources and temporary sinks for sediments and toxic substances delivered by river systems. Here, 14C and 137Cs isotopic dating methods are used along with ages of culturally related phenomena associated with mining and agriculture to determine rates of sedimentation and morphologic change for a reach of the upper Mississippi River and adjacent tributaries in... Categories: Publication; Types: Citation; Tags: Driftless Area, Floodplain, Floods, Human impacts, Mississippi River, All tags... Northeast CASC, Other Landscapes, Sedimentation rates, Fewer tags Quantifying the effect of land use land cover change on increasing discharge in the Upper Mississippi River Summary There is convincing evidence that land use/land cover (LULC) change has contributed to increasing discharge in the Upper Mississippi River Basin (UMRB) but key details remain unresolved. In this study, we extend our previous work (Zhang and Schilling, 2006) to quantify how much of the increasing discharge was due to LULC change. We examined daily streamflow for the 1890–2003 period from the US Geological Survey stream gage at Keokuk, Iowa and compiled county agricultural statistics for soybean production in the watershed above the gage to quantify how much of the change in the relation of discharge to precipitation was due to increased soybean cultivation. By allowing the slope of the discharge–precipitation... Categories: Publication; Types: Citation; Tags: Agricultural hydrology, Land cover land use change, Mississippi River, Northeast CASC, Other Landscapes, All tags... Row crop, Streamflow, Fewer tags UMRR Pool 13 Topobathy Separate data for floodplain elevation and bathymetry were collected on the Upper Mississippi River System (UMRS) by the US Army Corps of Engineers (USACE), Upper Mississippi River Restoration (UMRR) program. While many information needs can be met by using these data separately, in many cases seamless elevation data across the river and its floodplain are needed. This seamless elevation surface was generated by merging lidar (i.e., floodplain elevation) and bathymetry data. Merging the data required special processing in the areas of transition between the two sources of data. Categories: Data, Publication; Types: Citation, Downloadable, GeoTIFF, Map Service, Raster; Tags: Illinois, Iowa, Minnesota, Mississippi River, Navigation Pool 03, All tags... Navigational Pool 13, Upper Mississippi River, Wisconsin, bathymetry, lidar, topobathy, Fewer tags 1 2 »