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Publications

Read publications and other informational products to learn more about USGS science occurring in the Mississippi Basin.

Filter Total Items: 5583

Organochlorine chemical residues in bluegills and common carp from the irrigated San Joaquin Valley floor, California Organochlorine chemical residues in bluegills and common carp from the irrigated San Joaquin Valley floor, California

Samples of bluegills (Lepomis macrochirus) and common carp (Cyprinus carpio) collected from the San Joaquin River and two tributaries (Merced River and Salt Slough) in California were analyzed for 21 organochlorine chemical residues by gas chromatography to determine if pesticide contamination was confined to downstream sites exposed to irrigated agriculture, or if nonirrigated upstream...
Authors
Michael K. Saiki, Christopher J. Schmitt

Larval settlement into marine soft-sediment systems: Interactions with the meiofauna Larval settlement into marine soft-sediment systems: Interactions with the meiofauna

The distribution and abundance of organisms exhibiting complex life cycles, like marine invertebrates, reflect ecological processes operating at all stages in the life history. Few studies have yet considered the mortality patterns of larvae and juveniles. To test whether the permanent meiofauna play a role in macrofaunal larval site-selection, and/or if permanent meiofaunal predators or
Authors
Mary C. Watzin

Floods in the Floyd River basin, Iowa Floods in the Floyd River basin, Iowa

Flood elevation profiles and flood peak discharges for the floods of 1953, 1962, 1973, and 1983 in the Floyd River basin are given in this report. The profiles cover the Floyd and West Branch Floyd Rivers. The 1953 flood is the greatest known on the Floyd River since at least 1892.
Authors
A.J. Heinitz

Hydrology of carbonate aquifers in southwestern Linn County and adjacent parts of Benton, Iowa, and Johnson Counties, Iowa Hydrology of carbonate aquifers in southwestern Linn County and adjacent parts of Benton, Iowa, and Johnson Counties, Iowa

Groundwater is the major source of water in Linn County and the surrounding area. Approximately 90 percent of the groundwater production is from Silurian, Devonian, and Quaternary aquifers. The Silurian and Devonian aquifers consist of limestone and dolomite with minor shale beds, which have a regional dip to the southwest of approximately 20 feet per mile. The Silurian aquifer in east...
Authors
Kenneth Wahl, Bill J. Bunker

Water resources data Iowa, water year 1985 Water resources data Iowa, water year 1985

Water resources data for the 1985 water year for Iowa consist of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; ground-water levels and ground-water quality. This report contains discharge records for 111 stream-gaging stations; stage and contents for 8 lakes and reservoirs; water quality for 8 stream-gaging stations...
Authors
N.B. Melcher, M.G. Detroy, W.J. Matthes, R.E. Hansen

National water summary 1985: Hydrologic events and surface-water resources National water summary 1985: Hydrologic events and surface-water resources

The surface-water resources of the United States, the focal point for this National Water Summary, are extensively developed and managed to provide water supplies, hydroelectric power, navigation, recreational opportunities, and sufficient instream flows to maintain fish and wildlife habitats and adequate water quality. Surface water represents 77 percent of the Nation's total freshwater
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