# ASCII text file containing population density data for sub-basins defined
# by stations sampled by the USGS National Stream Quality Accounting Network (1996-2000)
# All populations and densities should be considered estimates as they are modified from the original sources
# by distribution from the original geographic units to the intervening watersheds
# Data for United States from 2000 Census (U.S. Census Bureau) using centroids of block groups (Geolytics CensusCD Redistricting, http://www.GeoLytics.com)
# Data for Canada from 1996 Census (http://ceps.statcan.ca/english/fedprofil/fedselect.cfm) using federal election districts
# Data for Mexico from 1990 (Instituto Nacional De Estacistica Geografia Informatica (INEGI)) using municipalities
# File is tab-delimited; missing values are denoted with period (.)
# The first header contains column names
# The second header contains column formats
# Basin = Basin code:
#       miss = Mississippi Basin
#       riog = Rio Grande Basin
#       colo = Colorado Basin
#       colum = Columbia Basin
# Station = Water-quality station number
# Pop-US = Population within United States									
# Pop-CA = Population within Canada									
# Pop-MX = Population within Mexico									
# Total = Total population									
# Sqmi = Sub-basin area, in square miles									
# Sqkm = Sub-basin area, in square kilometers									
# Den-mi = Population density, per square mile									
# Den-km = Population density, per square kilometer
#									
Basin	Station	Pop-US	Pop-CA	Pop-MX	Total	Sqmi	Sqkm	Den-mi	Den-km
miss	03216600	8495000	0	0	8495000	61530	159400	138	53
miss	03303280	7654000	0	0	7654000	34870	90320	219	85
miss	03378500	3934000	0	0	3934000	29270	75810	134	52
miss	03609750	4506000	0	0	4510000	40900	106000	110	43
miss	03612500	3618000	0	0	3618000	37010	95860	97.7	38
miss	05420500	6307000	0	0	6307000	92150	238700	68.4	26
miss	05587455	14630000	0	0	14630000	80330	208100	182	70
miss	06185500	359100	62330	0	421400	93220	241400	4.52	2
miss	06329500	349800	0	0	349800	69010	178700	5.07	2
miss	06338490	56100	0	0	56100	18630	48250	3.01	1
miss	06440000	394400	0	0	394400	61390	159000	6.43	2
miss	06610000	1682000	0	0	1682000	78500	203300	21.4	8
miss	06805500	3949000	0	0	3949000	85500	221500	46.2	18
miss	06934500	4918000	0	0	4918000	113400	293800	43.4	17
miss	07022000	3327000	0	0	3327000	18100	46890	184	71
miss	07263620	6216000	0	0	6216000	157800	408700	39.4	15
miss	07373420	4601000	0	0	4600000	73300	190000	62.8	24
miss	07381495	3309000	0	0	3310000	92900	241000	35.6	14
riog	08364000	1304000	0	0	1304000	39590	102500	33	13
riog	08374200	1137000	0	2170000	3300000	35400	91700	93.3	36
riog	08377200	6234	0	224000	230000	19100	49500	12	5
riog	08447410	243400	0	0	243000	44200	114000	5.51	2
riog	08450900	10570	0	142000	152000	7200	18600	21.2	8
riog	08459200	284700	0	511000	796000	11000	28400	72.5	28
riog	08461300	28340	0	805000	833000	24500	63500	34	13
riog	08470400	.	.	.	.	.	.	.	.
riog	08475000	60310	0	4310000	4380000	16000	41400	274	106
colo	09180500	341500	0	0	341500	23970	62090	14.2	5
colo	09315000	176100	0	0	176100	40800	105700	4.32	2
colo	09379500	225300	0	0	225000	22900	59400	9.82	4
colo	09380000	38740	0	0	38740	20430	52900	1.9	1
colo	09404200	285900	0	0	285900	37470	97050	7.63	3
colo	09421500	1530000	0	0	1530000	21310	55190	71.8	28
colo	09429490	164900	0	0	165000	16300	42100	10.1	4
colo	09522000	4661000	0	260000	4920000	62400	162000	78.8	30
colum	12400520	382200	161700	0	544000	60360	156300	9.01	3
colum	12472900	1065000	204800	0	1270000	35970	93150	35.3	14
colum	13353200	1270000	0	0	1270000	107900	279400	11.8	5
colum	14128910	1201000	0	0	1201000	37950	98280	31.6	12
colum	14211720	2343000	0	0	2343000	11200	29000	209	81
colum	14246900	1266000	0	0	1266000	5430	14060	233	90