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GWAA 2 Map04 Modified.FH10 Montana Bureau of Mines and Geology Montana Ground Water Assessment Atlas No. 2, Part B, Map 4 A Department of Montana Tech of The University of Montana December 2004 R 18W R 17W R 24W R 23WLake County R 22W R 21W R 20W R 19W F la th S e L a w a d . k C s e o e a C u R 00 114 n o n t 30 114 u t r n y a L t b y b a ( u 3 k H 0 3064 6 e Lake 7 3699 3100 f 3102 Swan t Mary Ronan . 3072 3527 ) T 25N 3500 Dayton Valley T 25N (3701 ft.) 3430 3400 3150 3300 3100 3200 3224 3096 3085 3563 3168 3048 3100 Reservation Boundary D 3212 a 3053 y Reservation Boundary to n Flathead County C r. 2984 Sanders County 2986 3000 3100 2900 2891 2881 2898 2887 3110 2900 Range 3000 3200 3249 2874 2850 T 24N 2850 T 24N 3200 2900 2811 2910 3221 Reservation Boundary 2905 2780 2863 Flathead Lake Swan Valley 2800 2893 2888 2882 2906 2873 (2892 ft.) 2885 2976 2798 Flathead County 3009 2774 S Lake County w 2919 a n 2766 3266 2900 2892 2911 2800 2893 3021 2889 R 3901 i 2875 v 2774 3046 2896 e 2901 r 2904 3300 3470 3300 2891 2823 3262 47 45 3371 3000 47 45 3110 2922 T 23N 3484 2883 2900 2881 T 23N 3102 2867 3265 3210 3083 2890 Little Bitterroot 3069 2898 3040 3056 2907 2876 3288 Valley 3008 2883 3049 3007 3019 2904 3367 2769 L 3096 i 2765 t t l 3057 e 3158 3070 2777 2901 3307 B 2758 i t t S 2766 e 2806 r r 3050 2898 2883 o a 2900 2766 2776 o 2912 t 3352 3042 l 3000 2906 2915 3357 3400 R i s 2915 iv 2960 2800 2950 e Polson 2952 2923 2941 3399 C r h 2891 2949 3400 2900 2968 2900 2972 2944 a 2972 2989 2950 2772 2765 2850 2960 2959 b Moraine 3000 2761 2961 2819 2771 2961 i 2767 2909 3050 n Polson 3219 2800 3222 2771 2871 3007 3100 2903 2973 3391 T 22N e 2771 2941 2846 T 22N 2776 Mission 2913 3150 3226 2766 3241 3421 t 2750 2942 3245 3319 3439 2762 2853 2981 2941 3086 3195 3311 2782 2770 2772 3234 3118 3230 3442 2763 3118 3200 3286 3289 2772 2716 2790 3438 2927 2764 2995 3201 3485 2771 2829 2954 Pablo Res. 3083 3440 2761 2946 3507 2684 2853 (3210 ft.) 3222 3073 3469 2935 2750 2850 2757 2986 3110 3186 2841 2750 M 2741 3014 R 17W 2861 3043 3223 R 18W Mission Valley 3176 2750 3111 o 2700 2800 2955 3009 3040 3222 2850 3115 Hot Springs 2928 2650 s u 2900 l 3014 3047 2735 l 3116 2950 i 3077 2825 3063 Lake County n H Pablo Sanders County 3033 M t 3393 2742 w 3058 k a e 3052 e 2758 i 3055 e 3085 V 3050 r o i 3029 3044 C 2755 n 3062 EXPLANATION 3048 3080 u y 2886 e 3034 s l 3134 l 3083 3077 n a Potentiometric surface contour showing line 2914 3031 2800 T 21N 3591 V 3093 T 21N of equal water-level altitude, dashed where t 3054 L 3006 3062 a i 3105 tt 2984 approximate. le 3062 3339 i B 3036 3029 Contour interval is 50 feet in the Mission and i 3000 n tt 3003 Little Bitterroot Valleys, and 100 feet in the Dayton, e 2916 r d r s o r u Swan and Jocko Valleys. o e M 3060 t iv R 3069 3247 R 2844 3048 3048 Generalized direction of ground-water flow iv 3011 3055 3201 e 3022 Camas Prairie r 3008 3238 3200 2968 Well completed in the alluvium 3020 3067 3100 2999 3073 Basin 2847 with water-level altitude. 3050 3040 Well completed in the alluvium less than 75 feet deep, 2971 3301 3294 2968 3026 Ronan Mission Valley only. 3356 3147 Range 2876 2700 3037 2927 Well completed in the bedrock (Belt Supergroup) 3023 d Township boundary 2828 a 3000 3010 2813 e Lower Crow 47 30 h Res. C 2786 t ro 47 30 Section boundary a w 3150 l 2900 2794 F 2631 Major road 2850 2867 2889 2976 k 2800 e 2961 2948 Cre 2964 Secondary road 2794 3017 T 20N T 20N 2978 2950 2795 3017 Flathead Indian Reservation boundary 2650 2891 2871 2900 2981 C 2644 County boundary a m 2863 2796 a 2831 2867 93 Hwy. Stream s 2950 3005 2914 3095 2796 2645 2946 2543 2864 3006 2912 Kicking Horse2938 Res. Federal/Tribal/State lands 2925 C 2794 (3062 ft.) ls re l Other lands e i 2850 Ninepipe k 2539 H Res. 2919 (3 0 3082 2918 1 2946 0 e 2919 ft .) 3013 s e 3174 i 2843 2872 2897 2 0 2 4 6 Miles o M M cD ona 2800 2800 ld L 2842 ake (3 2841 596 Scale 1:100,000 ft.) 2750 UTM Projection Zone 11 NAD27 2718 2715 2820 2711 2748 2700 2743 2859 T 19N 2779 2857 2522 2893 2820 T 19N Flathead Lake Area 2783 2720 2748 2654 2671 3067 Map Area 2528 k 2622 2650 2677 e 2716 2524 re 2600 C Miss ion t 2539 Cr os 2721 2774 eek P 2716 2721 3064 3064 3070 Fl ath 3057 ea d 2748 2897 2529 2780 T 18N 2744 2907 2538 2747 M is iver si R on 2507 2938 es. n R 2548 sio 2507 Mis 114 30 114 2550 2909 St. Ignatius R 23W 3104 T 18N R 24W 2969 3068 3182 R 22W J 2893 oc 3149 ko 2951 3168 3388 3252 Potentiometric Surface Map surface topography and ground-water flow is feet. The distribution of well depths is variable; over a distance of about 20 miles along the axis fill deposits consist of Tertiary (?) alluvial deposits Ground-Water Characterization Program Study Areas away from the mountains along the valley margins between Mission and Post Creeks west of of the valley. The relatively flat gradient reflects overlying the bedrock, and Quaternary alluvium R 2979 of the Southern Part of the toward the streams that drain the valleys. The Highway 93 and in the alluvium associated with the low relief of the surface topography in the and lacustrine deposits; there is no evidence of iv 3073 er Cr ground-water flow systems in the valleys are Mud Creek near Pablo, well depths are generally Little Bitterroot Valley as well as the high glacial till in the valley (Kendy and Tresch, 1996). 3151 ee Flathead Lake Area, Lake, strongly controlled by topography and the less than 75 feet. Where well depths are less than transmissivity of the Lone Pine aquifer. The deepest well in the valley penetrated 725 k Sanders, and Missoula distribution of permeable layers within the valley- 75 feet, ground water occurs under unconfined feet of valley-fill material without encountering 2692 2692 fill deposits. Summaries for the individual valleys conditions. In the center of the valley west of Records from GWIC indicate that there are at bedrock. Counties, Montana for which the potentiometric surface was mapped Highway 93 well depths are typically greater least 482 wells completed in the Little Bitterroot 3560 3428 Explanation are presented below. than 250 feet; east of Highway 93 toward the Valley; 262 of them are completed in the Lone Records from GWIC indicate that there are at R 21W 2694 3450 n = number of samples by Mission Mountain front, well depths are typically Pine aquifer. Yields from wells in the Lone Pine least 72 wells completed in the valley that supply John I. LaFave On this map ground-water flow appears to be less than 250 feet. The median well depth for the aquifer are relatively high compared to other domestic and stock water. Most wells are Percentiles horizontal, but there also are important vertical valley is 154 ft (figure 1). valleys and are reportedly as much as 1,100 gpm, completed in the valley-fill deposits; some are 95th components. Vertical ground-water flow is with a median of 60 gpm (figure 2). Most wells in the surficial alluvium (less than 50 feet deep) indicated by differing water-level altitudes in Across the rest of the valley, most water-bearing completed in the Lone Pine aquifer are between but most are in alluvium that is buried by Author's Note: This map is part of the Montana 75th 700 700 Bureau of Mines and Geology (MBMG) Ground- closely spaced wells that are completed at units are buried by layers of silt and/or clay and 200 and 330 feet deep (figure 1). There are lacustrine silts and clays. Around the valley Water Assessment Atlas for the Flathead Lake different depths. Vertical flow may be upward ground water is under semi-confined to fully records of 76 wells completed in the Belt bedrock; margin there are 17 wells completed in Belt Area ground-water characterization. It is intended or downward depending on position in the flow confined conditions. In a wedge-shaped area most of the bedrock wells are located in and near bedrock. Most wells are less than 200 feet deep, 47 15 system, and the geologic framework. Recharge between Ronan and Pablo west of Highway 93, the town of Hot Springs and along the valley and the median well depth is 80 feet (figure 1).
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