, to provide a permanent Federal agency to conduct the systematic and scientific classification of the public lands, and examination of the geological structure, mineral resources, and products of national domain. An integral part of that original mission includes publishing and disseminating the earth-science information needed to understand, to plan the use of, and to manage the Nation's energy, land, mineral, and water resources.

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Collection of hydrologic data� 12Surface-water records� 12Continuous-record streamflow and reservoir-content stations� 12Partial-record streamflow stations� 12 Low-flow partial-record stations� 12Crest-stage partial-record stations�12Flood-hydrograph partial-record stations� 12Flood-profile partial-record stations� 12Reconnaissance partial-record stations� 13Tide-level stations� 13 Continuous-record water-quality stations�13Daily water-quality stations� 13Daily chemical-quality stations� 13Daily suspended-sediment stations� 13Periodic water-quality stations� 13Periodic chemical-quality stations� 13