1. |
Long Term Resource Monitoring Program study areas. |
2. |
Mean discharge (m3sec-1 x 1,000)
for the period of record (dashed line) at St. Louis, Missouri,
and discharge for the 2004 water year (solid line). |
3. |
Water elevations (feet above mean sea level) for Pool
4, Upper Mississippi River System. |
4. |
Water elevations (feet above mean sea level)
for Pool 8, Upper Mississippi River System. |
5. |
Water elevations (feet above mean sea level) for Pool
13, Upper Mississippi River System. |
6. |
Water elevations (feet above mean sea level) for Pool
26, Upper Mississippi River System. |
7. |
Water elevations (feet above mean sea level) for the
Open River Reach, Upper Mississippi River System. |
8. |
Water elevations (feet above mean sea level) for La
Grange Pool, Upper Mississippi River System. |
9. |
Land cover/land use for the 1890s, 1975, 1989, and 2000
for the lower impounded section, Pool 13, Upper Mississippi River
System. |
10. |
Total suspended solids trends in the main channel of
four Long Term Resource Monitoring Program study areas, Upper Mississippi
River System. Values are mean concentrations (mg/L) in spring random
sampling, 19942004. |
11. |
Water temperatures (oC) in the Mississippi
River at (A) northern and (B) southern Long Term Resource
Monitoring Program study areas in winter random sampling, Upper Mississippi
River System, 19942004. Data are from all strata. No stratified
random sampling data were collected in Pools 4, 8, and 13 in 2003. |
12. |
Percent dissolved oxygen (DO) saturation in the Mississippi
River at (A) northern and (B) southern Long Term Resource
Monitoring Program study areas in winter random sampling, Upper Mississippi
River System, 19942004. Data are from all strata. No stratified
random sampling data were collected in 2003. |
13. |
Chlorophyll-a concentrations (µg/L) in
the Mississippi River at (A) northern and (B) southern
Long Term Resource Monitoring Program study areas in winter random
sampling, Upper Mississippi River System, 19942004. Data are
from all strata. No stratified random sampling data were collected
in 2003. |
14. |
Percent frequency of occurrence of submersed aquatic
vegetation by study reach, weighted by areas of aquatic strata. Percent
frequency of occurrence = number of occurrences/total number of rake
samples. |
15. |
Percent frequency of occurrence of submersed aquatic
vegetation for Pool 8, weighted by areas of aquatic strata. |
16. |
Mean mayfly (Ephemeridae) abundance in the Upper Mississippi
River System from 1993 to 2004. The Open River Reach was dropped from
the macroinvertebrate monitoring design in 2001. Pools 4 and 26 of
the Upper Mississippi River and La Grange Pool of the Illinois River
were not sampled in 2003. |
17. |
Mean fingernail clam (Sphaeriidae) abundance in the
Upper Mississippi River System from 1993 to 2004. The Open River Reach
was dropped from the macroinvertebrate monitoring design in 2001.
Pools 4 and 26 of the Upper Mississippi River and La Grange Pool of
the Illinois River were not sampled in 2003. |
18. |
Mean midge (Chironomidae) abundance in the Upper Mississippi
River System from 1993 to 2004. Horizontal lines are grand means.
The Open River Reach was dropped from the macroinvertebrate monitoring
design in 2001. Pools 4 and 26 of the Upper Mississippi River and
La Grange Pool of the Illinois River were not sampled in 2003. |
19. |
Mean fingernail clam (Sphaeriidae) abundance in Pool
8, Upper Mississippi River System, from 1993 to 2004. |