Predicted nitrate concentration, milligrams per liter as nitrogen Less than 0.50 0.50 to 0.99 1.0 to 1.9 2.0 to 4.9 5.0 to 9.9 Equal to or greater than 10 EXPLANATION Nitrate Predictions Observed nitrate concentration, milligrams per liter as nitrogen Less than 0.50 0.50 to 0.99 1.0 to 1.9 2.0 to 4.9 5.0 to 9.9 Equal to or greater than 10 EXPLANATION Nitrate Training Observations Trinity Trinity River River Eel River Eel River Russian Russian River River River River Sacramento Sacramento Feather River Feather River North North Yuba Yuba River River American River American River River River Mokelumne Mokelumne River River American American North Fork North Fork River River Tuolumne Tuolumne Merced Merced River River River River San Joaquin San Joaquin River River Joaquin Joaquin San San River River Kings Kings Salinas River Salinas River Kern River Kern River Quinn River Quinn River River River Humboldt Humboldt Reese River Reese River Sevier River Sevier River River River Bear Bear Jordan River Jordan River Meadow Valley Meadow Valley Wash Wash White River White River Pahranagat Wash Pahranagat Wash Muddy River Muddy River Amaragosa Amaragosa River River Verde River Verde River Salt River Salt River Colorado Colorado River River River River Gila Gila River River Mojave Mojave Rio Grande Rio Grande Chama Chama Rio Rio Puerco Puerco Rio Rio Owens River Owens River Grande Grande Rio Rio Great Salt Lake Walker Lake Pyramid Lake Rye Patch Reservoir Lake Tahoe Walker River Lake Mead Lake Mohave ARIZONA NEW MEXICO UTAH COLORADO MEXICO OREGON CALIFORNIA IDAHO WYOMING NEVADA 35° 40° 40° 124° 124° 117° 110° Reno Reno Sacramento Sacramento San Francisco San Francisco Stockton Stockton Modesto Modesto San Jose San Jose Fresno Fresno Bakersfield Bakersfield Las Vegas Las Vegas Los Angeles Los Angeles San Diego San Diego Yuma Yuma Phoenix Phoenix Tucson Tucson El Paso El Paso Flagstaff Flagstaff Santa Fe Santa Fe Albuquerque Albuquerque Salt Lake City Salt Lake City U.S. Geological Survey digital data, 1:2,000,000, 2,500,000, and 5,000,000 scale, 2003, 2005, and 2006 National Elevation Data 1:24,000, 1999 Albers Equal Area Conic Projection, central meridian -113, NAD 83 Pacific Ocean Las Cruces Las Cruces Observed and predicted nitrate concentrations in basin-fill aquifers of the Southwest Principal Aquifers study area By Kimberly R. Beisner, David W. Anning, Angela P. Paul, Tim S. McKinney, Jena M. Huntington, Laura M. Bexfield, and Susan A. Thiros 2012 Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. For sale by U.S. Geological Survey, Information Services, Box 25286, Federal Center, Denver, CO 80225, 1–888–ASK–USGS Digital files available at http://pubs.usgs.gov/sim/3234/ Suggested citation: Beisner, K.R., Anning, D.W., Paul, A.P., McKinney, T.S., Huntington, J.M., Bexfield, L.M., and Thiros, S.A., 2012, Maps of estimated nitrate and arsenic concentrations in basin-fill aquifers of the southwestern United States: U.S. Geological Survey Scientific Investigations Map 3234, pamphlet 8 p., 2 sheets. Printed on recycled paper 0 50 100 150 200 KILOMETERS NATIONAL GEODETIC VERTICAL DATUM OF 1929 Elko Elko U.S. Department of the Interior U.S. Geological Survey National Water-Quality Assessment Program Scientific Investigations Map 3234 Sheet 1 of 2 Southwest Principal Aquifer (SWPA) study-area boundary 117° 35° 110° Alamosa Alamosa Concentration data is from Anning and others, 2012 for an aquifer penetration depth of 200 feet. Systematic changes in predicted concentrations with aquifer penetration depth were not found in most areas 0 50 100 150 200 MILES
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Predicted nitrate concentration, milligrams per liter as nitrogen
Less than 0.50
0.50 to 0.99
1.0 to 1.9
2.0 to 4.9
5.0 to 9.9
Equal to or greater than 10
EXPLANATION
Nitrate Predictions
Observed nitrate concentration, milligrams per liter as nitrogenLess than 0.50
0.50 to 0.99
1.0 to 1.9
2.0 to 4.9
5.0 to 9.9
Equal to or greater than 10
EXPLANATION
Nitrate Training Observations
TrinityTrinity
RiverRiver
Eel RiverEel River
RussianRussian
RiverRiver
RiverRiver
Sacramento
Sacramento
Feath
er Ri
ver
Feath
er Ri
ver
NorthNorthYubaYuba River
River
American RiverAmerican River
RiverRiver
MokelumneMokelumne
RiverRiverAmericanAmerican
North
For
k
North
For
k
RiverRiverTuolumneTuolumne
MercedMerced
RiverRiver
RiverRiver
San JoaquinSan Joaquin
RiverRiver
Joaquin
Joaquin
SanSan
River
River
KingsKings
Salinas River
Salinas River
Kern River
Kern River
Quin
n Rive
r
Quin
n Rive
r
RiverRiver
Humboldt
Humboldt
Rees
e Riv
er
Rees
e Riv
er
Sevier R
iver
Sevier R
iver
Rive
rRi
ver
Bear
Bear
Jordan RiverJordan River
Mea
dow
Valle
y
Mea
dow
Valle
yWa
shWa
sh
White River
White River
Pahranagat Wash
Pahranagat Wash
Muddy
RiverM
uddy
River
Amaragosa
Amaragosa
RiverRiver
Verde River
Verde River
Salt RiverSalt River
Colorado
Colorado
RiverRiver
RiverRiverGilaGila
RiverRiverMojaveMojave
Rio GrandeRio Grande
ChamaChama
RioRio
PuercoPuerco
RioRio
Owens River
Owens River
GrandeGrande
RioRio
Great Salt Lake
WalkerLake
PyramidLake
Rye PatchReservoir
LakeTahoe
Walker
River
LakeMead
LakeMohave
ARIZONA NEW MEXICO
UTAH COLORADO
MEXICO
OREGON
CALIFORNIA
IDAHO
WYOMINGNEVADA
35°
40°
40°
124°
124°
117°
110°
RenoReno
SacramentoSacramento
SanFrancisco
SanFrancisco
StocktonStockton
ModestoModesto
San JoseSan Jose
FresnoFresno
BakersfieldBakersfield
Las VegasLas Vegas
Los AngelesLos Angeles
San DiegoSan DiegoYumaYuma
PhoenixPhoenix
TucsonTucson
El PasoEl Paso
FlagstaffFlagstaff
Santa FeSanta Fe
AlbuquerqueAlbuquerque
Salt Lake CitySalt Lake City
U.S. Geological Survey digital data, 1:2,000,000, 2,500,000, and 5,000,000 scale, 2003, 2005, and 2006National Elevation Data 1:24,000, 1999Albers Equal Area Conic Projection, central meridian -113, NAD 83
Pacific Ocean
LasCruces
LasCruces
Observed and predicted nitrate concentrations in basin-fill aquifers of the Southwest Principal Aquifers study areaBy
Kimberly R. Beisner, David W. Anning, Angela P. Paul, Tim S. McKinney, Jena M. Huntington, Laura M. Bexfield, and Susan A. Thiros2012
Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.
For sale by U.S. Geological Survey, Information Services, Box 25286, Federal Center, Denver, CO 80225, 1–888–ASK–USGS
Digital files available at http://pubs.usgs.gov/sim/3234/
Suggested citation: Beisner, K.R., Anning, D.W., Paul, A.P., McKinney, T.S., Huntington, J.M., Bexfield, L.M., and Thiros, S.A., 2012, Maps of estimated nitrate and arsenic concentrations in basin-fill aquifers of the southwestern United States: U.S. Geological Survey Scientific Investigations Map 3234, pamphlet 8 p., 2 sheets.Printed on recycled paper
0 50 100 150 200 KILOMETERS
NATIONAL GEODETIC VERTICAL DATUM OF 1929
ElkoElko
U.S. Department of the InteriorU.S. Geological Survey
National Water-Quality Assessment Program Scientific Investigations Map 3234Sheet 1 of 2
Southwest Principal Aquifer (SWPA) study-area boundary
117°
35°
110°
AlamosaAlamosa
Concentration data is from Anning and others, 2012 for an aquifer penetration depth of 200 feet. Systematic changes in predicted concentrations with aquifer penetration depth were not found in most areas