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USGS Daily Statistics for the Nation

The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 06038500 Madison River bl Hebgen Lake nr Grayling MT


Gallatin County, Montana
Hydrologic Unit Code 10020007
Latitude  44°51'59.01", Longitude 111°20'19.61" NAD83
Drainage area 931  square miles
Gage datum 6,448.47 feet above NGVD29
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1938-10-01 -> 2025-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 921 870 825 916 901 1,210 1,100 1,080 1,100 1,120 1,300 1,070
2 920 874 828 919 882 1,240 1,070 1,090 1,090 1,170 1,310 1,040
3 919 873 825 931 871 1,250 1,070 1,080 1,080 1,160 1,320 1,000
4 916 872 820 930 864 1,260 1,050 1,090 1,070 1,160 1,310 984
5 916 870 817 920 848 1,290 1,050 1,080 1,070 1,150 1,310 976
6 920 868 822 920 837 1,320 1,040 1,070 1,070 1,150 1,310 968
7 924 862 825 931 833 1,320 1,020 1,070 1,070 1,160 1,300 959
8 919 856 829 946 824 1,320 1,010 1,060 1,090 1,150 1,300 961
9 914 855 826 960 823 1,330 1,000 1,060 1,100 1,160 1,320 956
10 916 855 818 959 817 1,350 1,020 1,060 1,110 1,190 1,340 948
11 920 854 819 944 810 1,330 1,010 1,050 1,110 1,190 1,330 950
12 919 853 818 939 821 1,300 1,020 1,050 1,120 1,200 1,330 954
13 916 858 813 943 836 1,280 1,020 1,040 1,100 1,220 1,310 968
14 919 860 826 945 839 1,290 1,000 1,040 1,100 1,250 1,300 974
15 917 857 848 946 843 1,290 999 1,050 1,100 1,260 1,300 975
16 912 858 856 952 857 1,270 1,000 1,050 1,100 1,260 1,280 972
17 903 854 862 951 870 1,250 1,010 1,040 1,110 1,270 1,280 966
18 898 852 863 948 872 1,240 1,020 1,030 1,110 1,270 1,260 962
19 897 852 861 937 863 1,240 1,020 1,030 1,110 1,300 1,270 962
20 899 853 860 933 862 1,220 1,030 1,040 1,110 1,300 1,280 960
21 897 854 868 936 866 1,180 1,050 1,040 1,110 1,300 1,290 965
22 892 853 874 935 880 1,160 1,040 1,030 1,100 1,300 1,270 963
23 889 847 877 930 894 1,140 1,040 1,040 1,090 1,290 1,220 950
24 886 840 879 923 917 1,120 1,040 1,050 1,080 1,250 1,200 934
25 880 835 882 924 937 1,120 1,040 1,070 1,070 1,250 1,180 934
26 874 831 883 929 968 1,110 1,060 1,080 1,090 1,250 1,170 934
27 872 829 885 924 1,030 1,140 1,070 1,090 1,100 1,250 1,160 932
28 872 826 891 917 1,080 1,160 1,070 1,080 1,100 1,280 1,140 928
29 874 834 893 907 1,130 1,160 1,070 1,080 1,100 1,290 1,120 927
30 870   905 905 1,160 1,140 1,070 1,090 1,110 1,290 1,100 929
31 868   915   1,170   1,080 1,090   1,290   927