Question

1. a. In which direction is the Souris River flowing? From ___ to ___.b. How can you tell?2. a. What

is the approximate width of the Souris River channel? ___ feet

b. What is the approximate width of the Souris River floodplain? ___ feet

c. What evidence suggests that the river is widening its valley through lateral erosion?

3. Compare the present length of the meandering Souris River course shown on the map with the length of a river flowing down this valley if it were not meandering. (You can measure the distance with a piece of string, or your instructor can show you a more precise method.)

a. Length of present meandering course. ____ miles

b. Length of a straight course down the valley: ____ miles

4. Natural levees can be seen along the Souris River in the center portion of the map (north of Westgaard Cemetery . Approximately how high are the levees? ___ feet

1. Explain the formation of the narrow, triangle shaped lake just to the east of Westgaard Cemetery (in the NE 1/4 of Section 3). You may just sketch to illustrate your answer.

b. Describe a location of two more lakes, swamps, or topographic depressions along the Souris River that formed in a similar way. (You may refer to Public Land Survey township quarter sections to simplify your location description.)

2. a. Describe a location where the formation of new cutoff meander in the Souris River appears imminent.

b. Sketch the current river course.

c. Sketch the new river course after the cutoff/

1. Find “Willow Cut-off” and “Albemarle lake” (an oxbow lake) in the center of the map. What natural features shown on the map suggest that a channel of the river once followed a course between the boundary course and the present course?

b. Name two other oxbow lakes shown on the map (either naturally or artificially produced.)

2. Compare the length (in miles0 of the boundary course of the river with the main channel of the present course.

a. Length of present course: ___ miles

b. Length of boundary course? ____ miles

c. Amount of shortening: ___ miles

d. The present course length represents what percentage of the boundary course length ((present /boundary) * 100) ____ %

3. In general, how is the gradient of the present course different from the gradient of the boundary course? (In other words, is the present course steeper or less steep than the boundary course?)

4. Compared to the boundary course, why would the present course of the Mississippi River be an advantage to river traffic such as barges?

1 a. To the west of Hollybrook, find the streams names Otter bayou and Swan lake. What kind of floodplain landform explains the curved paths taken by these streams?

b. Which human- built feature nearby appears to have been influenced by the same kind of landform?

2. Other than the levees, does there appear to be any land more than 25 feet higher than the river between Alsatia and the Mississippi river itself?

3. The Yazoo River (from which the geographic term yazoo stream was taken flows intothe Mississippi River just south of this portion of the map. Name another yazoo stream or creek shown on the map that parallels the Mississippi for at least 10 miles.

 

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