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Mississippi River Depth Were Created by Interpolating the Thalweg Depth Track Recorded with a Garmin 178C GPS/Sounder with ESRI Arcgis Topo to Raster Tool

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Mississippi River Depth Were Created by Interpolating the Thalweg Depth Track Recorded with a Garmin 178C GPS/Sounder with ESRI Arcgis Topo to Raster Tool APPENDIX A Site-specific maps of the channel survey and fish community sampling locations on the Mississippi River. Aerial images are from FSA 2008 17 Mississippi Channel Morphology Survey 2008 Survey Site 29-7 Downstream of Highway 6 H W Y 6 Cross Section Water surface elevation point 0200 400 800 Benchmark placed Feet 18 Mississippi Channel Morphology Survey 2008 Survey Site 30-16 Upstream of Black Bear access Cross Section Water surface elevation point Benchmark placed 0200 400 Feet 19 Mississippi Channel Morphology Survey 2008 Survey Site 31-22 Upstream of French Rapids access 0200 400 800 Feet Cross Section Water surface elevation point Benchmark placed 20 Mississippi Channel Morphology Survey 2008 Survey Site 32-26 In Brainerd upstream of Hwy 210 Cross Section Water surface elevation point Benchmark placed 0200 400 800 Feet 21 Mississippi Channel Morphology Survey 2008 Survey Site 33-30 In Crow Wing State Park Cross Section Water surface elevation point Benchmark placed 0200 400 800 Feet 22 MISSISSIPPI RIVER SURVEY REPORT BRAINERD FISHERIES MANAGEMENT AREA CROW WING COUNTY, MINNESOTA APPENDIX B RIVER DEPTH Owen Baird Minnesota Department of Natural Resources Section of Fisheries Brainerd, Minnesota April 2008 Depth Maps The digital elevation models (DEM) of the Mississippi River depth were created by interpolating the thalweg depth track recorded with a Garmin 178C GPS/Sounder with ESRI ARCgis topo to raster tool. A line of the shore, including islands was used as a zero depth contour. In areas with multiple channels around islands or areas with extensive backwaters, such as above French Rapids, depths outside of the main channel thalweg are most likely erroneous and should not be relied upon. The color scale used to depict the depth was chosen to provide maximum detail, however, it appears that all deep pools are over twenty feet deep based on the scale, but this is however, not true. To determine actual depths consult the depth graphs found after the depth maps. The best use of these maps is for relative depth. Actual depth will vary widely depending on river discharge. These maps are not intended for and should not be used for navigation. In the future additional depth mapping may be done in areas with islands and multiple channels to improve the map quality. A DNR bathymetric map of Rice Lake including the Mississippi River upstream to Little Rabbit Lake is a better source for river depths in that area, particularly outside of the thalweg. 2 Mississippi River Depth Highway 6 Bridge downstream to the Pine River Pine River HW 6 Depth 0 ft 26 ft Miles 010.5 3 Mississippi River Depth Pine River Pine River downstream to the Black Bear Lake Outlet Access Depth 0 ft 26 ft Black Bear Lake Access Miles 010.5 4 Mississippi River Depth Black Bear Lake Access Black Bear Lake Outlet Access downstream to Little Rabbit Lake Half Moon Landing Depth 0 ft 26 ft Little Rabbit Lake Miles 010.5 5 Mississippi River Depth Little Rabbit Lake downstream to the French Rapids Access Little Rabbit Lake Depth 0 ft 26 ft Note: Backwater areas not mapped French Rapids Access Miles 010.5 6 Brainerd Dam Mississippi River Depth Brainerd Dam downstream to First Island Evergreen Landing HW 210 Depth 0 ft College Dr. 28 ft First Island Miles 010.5 7 Mississippi River Depth First Island downstream First Island to canoe campsite HW 371 Depth 0 ft Campsite 27 ft Miles 010.5 8 Mississippi River Depth Canoe campsite downstream to the Crow Wing River Campsite Depth 0 ft Crow Wing River 27 ft Crow Wing State Park boat launch Miles 010.5 9 Crow Wing River Mississippi River Depth Crow Wing River downstream to Camp Ripley Crossing Depth 0 ft 27 ft Nokasippi River Camp Ripley Crossing Miles 010.5 10 Depth Graphs The following depth profile graphs of the Mississippi River in Crow Wing County, Minnesota were derived from the DEMs of the river depth. River depth should be viewed as relative as the actual depth will vary widely based on river discharge. River discharge during mapping is presented in Table 1. Diamonds across the top to the graphs represent river miles. The triangles represent major landmarks within each reach. 11 0 -2 RM 1031 RM 1027 HW 6 Power line -4 -6 -8 -10 Depth (ft) -12 -14 -16 -18 -20 -0.2 0.8 1.8 2.8 3.8 4.8 5.8 Miles Downstream from Highway 6 Bridge Figure B-9. Thalweg depths of the Mississippi River in the lower half of reach 29 from the Highway 6 bridge downstream to the mouth of the Pine River. 12 0 -2 RM 1025 RM 1016 Black Bear Half Moon Access Landing -4 -6 -8 -10 Depth (ft) -12 -14 -16 -18 -20 0123456789101112 Miles Downstream from Pine River Confluence Figure B-10. Depth of the Mississippi River reach 30 from the Pine River mouth downstream to Little Rabbit Lake. 13 0 RM 1015 RM 1010 -5 Power Canoe Line Access -10 Depth (ft) Depth -15 -20 -25 01234567 Miles Downstream from Little Rabbit Lake Figure B-11. Depth of the Mississippi River reach 31 from Little Rabbit Lake downstream to the French Rapids Access. 14 -1 RM 1006 RM 1004 RR College -3 Evergreen HW 210 Dr. Access Laurel -5 -7 Depth (ft) -9 -11 -13 -15 0123 Miles Downstream from Brainerd Dam Figure B-12. Depth of the Mississippi River reach 32 from the Brainerd Dam downstream to the College Drive bridge. The maximum depth in the Brainerd Dam tailrace pool is about 27 ft. 15 0 RM 1000 RM 995 River Mouth -2 First Island HW 371 Boat Launch -4 -6 Depth (ft) Depth -8 -10 -12 -14 0246810 Miles Dowstream from the College Dr. Bridge Figure B-13. Depth of the Mississippi reach 33 from the College Drive bridge downstream to the mouth of the Crow Wing River. 16 0 RM 985 RM 990 Nokasippi River -2 -4 -6 Depth (ft) -8 -10 -12 -14 0246810 Miles Downstream from the Crow Wing River Figure B-14. Depth of the Mississippi reach 34 from the mouth of the Crow Wing River downstream to the Crow Wing County line and the Camp Ripley crossing. 17 CWC Water Plan ----------------------------------------------------------------------------------------------------------------------------- APPENDIX 6: PRIORITY CONCERNS SCOPING DOCUMENT Due to file space considerations, please view these online: http://www.co.crow-wing.mn.us/index.aspx?NID=241 .
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