405 
in the 31 miles below Kampsville (2.44 inches per mile) was more than 
in the short swift stretch between Peoria and Pekin. 
A comparatively well-scoured channel bottom is found most of the 
way from Lagrange to the mouth, sand, mud and shell, or dirty sand 
prevailing, and such mud bottom as occurs being usually hard and 
covered at most with only a very thin layer of recent silt. Inside the 
7-foot line in 1915 a soft light-colored silt 2 inches to more than 12 
inches deep was found at most of our collecting stations. The most im- 
portant local stretches of muddy channel in 1915 were 6 miles imme- 
diately above the Kampsville.dam; and about 4 miles just above the 
mouth of the river. A less important short section of muddy channel, in 
WIDTHS AND DEPTHS, LAGRANGE DAM To GraFrron, Low WATER, 1901 
Miles ; 
above Station Width, ft. Depth, ft. 
Grafton HRS 
77.0 1% mile below Lagrange dam 658 13.1 
UATE MM IE -crchararctee al ooeic-cnn eee slg aa ere se 805 8.2 
PROERMMENG nhs aleve fi sere pea svete omaha GE a ieyae 586 14.0 
okt || Ren Spohr ta.) cei orate 658 12.7 
71.5 IM Greg OSial -o:4 cierevovsraneretace sontarete 1,006 9.1 
68.0 ee Re cere era yaa wicca ces terevstert ns 658 ier 
GO beat haciteites be c.ecikahaerscatak aieiore are 1,006 10.3 
65.5 INADIGS oc .c 1m oreinaitie Semesters 787 8.7 
GAO Mikes stale arwccrcccataels clatcls mane ceteris 951 6.9 
OZ) 0 011! SSO SEE EIgIO PEROT Lea n teen a 823 a3 
Pr anes te Peto P sl syes-orave Ge ater ick cceyseo-erc vedio 567 ayes 
LV DD MMMIPRIE Cai cic ore creis thors utee Phen e re 1,024 6.9 
55.5 HUOTONCE. "3 7.cG Gin cakes 1,025 8.8 
BY seo |. aS ee OG eR yc) ee 658 15.6 
FED rae pe haya nS cia ie Oe wrere poate che eis ecu ce eeeee 975 9.0 
ATEDieme We cts. da’ sheie des cake Cat ce oeawieme ne 1,116 10.9 
AMIMTIN PE fasc cine Rca eS micle: Sate acetate ee 933 10.3 
41.2 2 miles below Pearl....‘.... 1,317 10.5 
OR Mais ‘crpivace, ev araraters aerate Stchasatoce agi cree 1,409 12.3 
OHM lescsts tele = ove cas ot slaskimvievawih sora iors 1,482 10.2 
Si S155 a pl | SR On Param emp tear tenet eee 1,043 14.5 
33.0 1 mile above Kampsville.... 1,354 11.3 
31.8 500 yards above dam....... 1,180 13.7 
BLS 300 yards below dam....... 1,317 10.0 
Oia Me lian hao chsh hens ate ers ae hohe ale eaneratstes 1,006 20.0 
ENE Senge |. Sie ERA SIEGE) BAe SA Witt rareranen 1,079 9.2 
21.3 FAARGID) Ge) spete's ersgceseneveacorsvee 1,134 8.1 
OLS Maelo ss tcrsteis) «(jn ol vate era geieeeeie eee eaninic 1,116 6.5 
SES i Teen str aiocal a tr aiceepal dic Nerettendtala era che fee 1,208 7.2 
TOUS eA sae. tos-ce Wh caret lavenaeee ere ete meet oe 768 14.7 
BAS PNW asark va /arete (cg ate ame < ensaeeeRe 1,061 8.1 
NOLO Mg In iee adoro eleteicla.c seria ee Sheets ies 732 19:2 
TSP, il MES Semce tn terete on socrarrrs Ses eae ee ots 1,189 7.8 
7.3 Foot of Six Mile Island..... 1,610 8.7 
Cig eal WeseaHige ey attempters nec aie cad 1,098 14.0 
ERRNO Nicrccts wena onerchar aelewpsean- Sa Seams hee 1,263 14.2 
AN Oe PWS Sieve arate wats ctexetavesd ‘a ata ce.e/areele 768 14.4 
3.0 1 mile above mouth......... 677 18.4 
