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GWAA 2 Map4 Modified Tiled.FH10 Montana Ground-Water Assessment Atlas No. 2, Part B, Map 4 December 2004 Montana Bureau of Mines and Geology A Department of Montana Tech of The University of Montana Potentiometric Surface Map of the Southern Part of the Flathead Lake Area, Lake, Missoula, Sanders Counties, Montana by John I. LaFave Note - this map was originally published at a scale of 1:100,000 but the page sizes have been modified to fit the size of the paper in your printer. A full sized 36 X 48 colored print of this map can be ordered from the Office of Publications and Sales of the Montana Bureau of Mines and Geology, 1300 West Park Street, Butte, MT 59701. Phone: 406-496-4167 Web Address: www.mbmg.mtech.edu Montana Bureau of Mines and Geology A Department of Montana Tech of The University of Montana R 24W R 23WLake County R 22W R 21W . s e R rt 30 114 a b b u H Lake 3699 Mary Ronan 3527 3500 Dayton Valley T 25N (3701 ft.) 3430 3400 3300 3200 3224 3096 3563 3168 3048 3100 Reservation Boundary D 3212 a y 3053 to n Flathead County C r. 2984 Sanders County 2986 3000 3100 2900 2891 2881 2898 2887 2900 3000 2874 2850 T 24N 2850 2900 2811 3221 2910 2905 2780 2800 2893 2888 2906 2873 2976 2798 Flathead County 3009 2774 Lake County 2766 3266 00 8 Montana Ground Water Assessment Atlas No. 2, Part B, Map 4 December 2004 R 20W R 19W R 18W R 17W F la th S e L a w a d k C e o a C u 114 00 114 n o n u t n y L ty a ( 3 k 0 3064 6 e 7 3100 f 3102 Swan t .) 3072 T 25N 3150 3100 3085 Reservation Boundary 3110 Range 3200 3249 T 24N 3200 Reservation Boundary 2863 Flathead Lake Swan Valley 2882 (2892 ft.) 2885 S w 2919 a n 00 29 2892 8 2 3901 2774 3470 3371 47 45 3 T 23N 3484 3102 3210 3 Little Bitterroot 3069 3056 Valley 3008 3 3019 2769 L 3096 i 2765 t t l 3158 3070 2777 e B 2758 i t t S 2766 e r r 3050 o a 2766 2776 o 2912 t 3352 3042 l 3000 R i iv s 2800 e 2950 C r h 2891 2900 2900 a 2772 2765 2850 b 2819 2761 2771 i 2767 2909 n 2771 2800 2871 T 22N e 2771 2941 2846 2776 2913 2766 t 2750 2762 2853 2941 2782 2770 2772 2763 2772 2716 2790 2927 2764 2771 2829 2 2761 2946 2684 2853 2935 2750 2850 2757 2 2841 2750 M 2741 30 2861 2750 o 2700 2800 2955 Hot Springs 2928 2850 2650 s u 2900 l 2735 l 2950 i 2825 Lake County n H Sanders County M t w 2742 a e 2758 i o i V 2755 n u y s 2886 e ll n a T 21N 2914 3591 V t L a i tt 2984 le i B i n tt e 2916 r r s o er o iv t R R 2844 iv e Camas Prairie r Basin 2847 2876 2700 d 2828 a 2813 e Lowe h R 47 30 t 2892 29 2893 2911 3021 2889 R i 2875 v 3046 2896 e 2901 r 2904 3300 3300 2891 2823 3262 3000 47 45 3110 2922 2883 2900 2881 T 23N 2867 3265 3083 2890 9 2898 3040 2907 2876 3288 2883 3049 3007 2904 3367 3057 2901 3307 2806 2898 2900 2883 2906 2915 3357 3400 2915 2960 2952 2923 2941 Polson 2949 3400 3399 2968 2972 2944 2972 2989 2950 2960 2959 Moraine 2961 3000 2961 3050 Polson 3219 3222 3007 3100 2903 2973 3391 T 22N Mission 3150 3226 3241 3421 2942 3245 3439 2981 3319 3086 3195 3311 3234 3118 3230 3442 3118 3200 3286 3289 3438 2995 3201 3485 2954 3440 Pablo Res. 3083 3507 (3210 ft.) 3222 3073 3469 2986 3186 14 3110 R 18W R 17W Mission Valley 3043 3223 3111 3176 3009 3115 3040 3222 3014 3047 3116 Pablo 3077 3063 3033 3393 3058 k 3055 3052 e 3085 3050 re 3029 C 3062 3044 EXPLANATION 3048 3080 3034 3134 3083 3077 3031 2800 Potentiometric surface contour showing line 3093 3054 T 21N of equal water-level altitude, dashed where 3006 3105 3062 approximate. 3062 3339 3036 3029 Contour interval is 50 feet in the Mission and 3000 3003 Little Bitterroot Valleys, and 100 feet in the Dayton, d u Swan and Jocko Valleys. M 3060 3069 3247 3048 3048 Generalized direction of ground-water flow 3011 3055 3201 3022 3008 3238 3200 2968 Well completed in the alluvium 3020 3067 3100 2999 3073 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 Ra 3037 2927 Well completed in the bedrock (Belt Supergroup) 3023 3000 Township boundary 3010 n er Crow Res C 47 30 Section boundary 47 30 h R 2786 t a l 2900 2794 F 2631 2850 28 2800 T 20N 2794 2795 2650 289 C 2644 a m 2863 2796 a s 2645 2950 2796 2543 C 2794 ls re l e i k 2539 H 2946 e s e i o M 2718 2715 2711 T 19N 2522 2654 267 2528 2 2524 2622 2600 Mis sion 2539 Fla the ad T 18N 2529 2538 r Rive 2507 2548 2507 R 23W 30 114 2550 R 24W R 22W J oc ko 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 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 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 ive 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). r 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 Sanders, and Missoula distribution of permeable layers within the valley- 75 feet, ground water occurs under unconfined feet of valley-fill material without encountering 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 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 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 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 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) Author's Note: This map is part of the Montana 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 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, to stand alone and describe a single hydrogeologic 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). REFERENCES aspect of the study area, although many of the areas, discharge areas, and places where low well depths are 300 to 500 feet below land surface, margin. Bedrock well depths and yields are more Reported yields are generally less than 30 gpm; Abdo, G., 1997, Reappraisal of hydrogeology of area's hydrogeologic features are interrelated.
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