14    Bathymetric Surveys at Highway Bridges Crossing the Missouri River in Kansas City, Missouri, using a Multibeam Echo Sounder, 2010 Results of Bathymetric Surveys    15

94°38'59"

94°39'

94°39'01"

94°39'02"

94°39'03"

94°39'04"

39°09'16"

39°09'15"

39°09'14"Base from National Agricultural Imagery Program, 2007Universal Transverse Mercator projection, Zone 15Horizontal coordinate information referenced to the North American Datum of 1983 (NAD 83)Vertical coordinate information referenced to the North American Vertical Datum of 1988 (NAVD 88)

Pier 3

Figure 9. Bathymetric survey of the Missouri River channel in the vicinity of the main channel pier of structure A1800 on Interstate 635 in Kansas City, Missouri.

March 15, 2010

129,000 cubic feet per second

734.83 feet above NAVD 88710

710

710

700

700

700

710

700

710

710

710

710

700

700

700

710

700

710

Subtle “steps” and waveslikely caused by dune movementinto and around the scour hole

FLOW

Longitudinal section shown in figure 43A

A

A'

N

Survey Date

Discharge (based on discharge at streamflow-gaging station at Kansas City)

Average water-surface elevation

The higher resolution data aroundthe pier were obtained with a tiltedtransducer head after all the other bathymetric data were obtained for that day, resulting in a difference in

channel-bed elevations between the high and low resolution data sets. This difference is most noticable along the boundary between the

data sets.

0 10 20 30 40 50 60 FEET

0 5 10 15 20 METERS

Channel-bed elevation, in feet above NAVD 88

Topographic contour— Shows channel-bed elevation, in feet above NAVD 88. Contour interval is 2 feet

EXPLANATION

728726724722720718716714712710708706704702700698696694692

710710

Figure 9.  Bathymetric survey of the Missouri River channel in the vicinity of the main channel pier of structure A1800 on Interstate 635 in Kansas City, Missouri.