Nutrients National Synthesis

Material for 1997 Summary Reports

National graphics

GIF files are intended for viewing only, not for publication output.

Maps showing nutrient concentrations in streams, conterminous U.S.

NOTE:
Ag, mixed, and undeveloped maps revised 10/28/2002.
All maps revised again 11/27/2002. N input units now are lb/acre.
Ag and mixed maps revised 12/03/2002 and 1/13/2003.
Ag maps revised 1/14/2003.

• Total N in streams 1993-2001 (Ag land-use areas) - EPS file | GIF file
• Total P in streams 1993-2001 (Ag land-use areas) - EPS file | GIF file
• Total N in streams 1993-2001 (Urban land-use areas) - EPS file | GIF file
• Total P in streams 1993-2001 (Urban land-use areas) - EPS file | GIF file
• Total N in streams 1993-2001 (Mixed land-use areas) - EPS file | GIF file
• Total P in streams 1993-2001 (Mixed land-use areas) - EPS file | GIF file
• Total N in streams 1993-2001 (Undeveloped areas) - EPS file | GIF file
• Total P in streams 1993-2001 (Undeveloped areas) - EPS file | GIF file

Maps showing nutrient concentrations in streams, Alaska and Hawaii

10/11/2002

• Total N in streams 1993-2001 (Urban land-use areas) - EPS file | GIF file
• Total P in streams 1993-2001 (Urban land-use areas) - EPS file | GIF file
• Total N in streams 1993-2001 (Mixed land-use areas) - EPS file | GIF file
• Total P in streams 1993-2001 (Mixed land-use areas) - EPS file | GIF file
• Total N in streams 1993-2001 (Undeveloped areas) - EPS file | GIF file
• Total P in streams 1993-2001 (Undeveloped areas) - EPS file | GIF file

11/05/2002

• Nitrate concentrations in shallow ground water (agricultural areas and urban areas) - EPS file | Illustrator file* | GIF file
• Nitrate concentrations in major aquifers - EPS file | Illustrator file* | GIF file
• *Custom font required for dot symbols to show up as dots in Illustrator files - USGSCUST.TTF

Revised 12/19/02

• Nitrogen - EPS file | GIF file
• Phosphorus - EPS file | GIF file

Supporting data

• National nutrients summary data for rivers and streams from NAWQA Study Units during Cycle I (1992-2001) - Excel file Revised 12/16/2002
• Explanation for national analysis of nutrient concentrations in streams and rivers - Word file 10/31/2002
• National statistics for ground-water nutrients - Excel file 10/28/2002
• Description of data-handling and statistical procedures used to prepare ground-water statistics - Word file 10/28/2002

Material for 1994 Summary Reports

The material prepared for the 1994 summary reports is outdated, and we have placed the information in an archive.