05553500 DATA: Benthic Macroinvertebrates, 1998

ILLINOIS RIVER BASIN

05553500 ILLINOIS RIVER AT OTTAWA, IL

LOCATION.-- Lat 41°20'17", long 88°51'10", in SW1/4SW1/4 sec.11, T.33 N., R.3 E., LaSalle County, Hydrologic Unit 07130001 downstream of the railroad bridge, 0.25 miles, and downstream 0.5 miles of the Route 23 bridge in Ottawa and the confluence with the Fox River.

DRAINAGE AREA.-- 10,949 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: November 11, 1902 to December 31, 1903.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1997-2000.

MISCELLANEOUS: Contaminants in streambed sediments, August 1998; contaminants in fish tissue, August, 1998.

BIOLOGICAL: Benthic Macroinvertebrates, September 1998, July 1999; fish, August 1998 and August 1999.

GAGE.-- Chain gage read twice daily. Prior to November 1, 1903, vertical staff at west end of first pier from the north abutment of the railroad bridge at same datum. Datum of gage is 579.48 ft above sea level (Chicago city datum).

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 46,900 ft³/s, Apr. 15, 1903, gage height, -119.08 ft CCD (460.40 ft above sea level); minimum discharge, 6,740 ft³/s, Sept. 8, 1903.

REMARKS FOR CURRENT YEAR.--Benthic macroinvertebrate community samples were collected as part of the National Water-Quality Assessment program (NAWQA) in the lower Illinois River Basin. One quantitative (Richest-Targeted Habitat) and one qualitative (Qualitative-Multiple Habitat) sample were collected in accordance with the NAWQA protocols (Cuffney and others, 1993). The quantitative sample was a composite of macroinvertebrates from about 10 submerged tree branches. Branches were cut underwater, gathered in a 425µm mesh net, and invertebrates were washed or picked from the branches. The average length and average diameter of each branch were measured and used to calculate an approximate surface area. The qualitative sample was collected from many habitat types within the sampling reach to obtain as complete a list of invertebrate taxa as possible. All samples were processed by the USGS National Water-Quality Laboratory. Phylum, Class, Order, Suborder, Family, Subfamily, and Tribe are listed and arranged according to the USGS National Water-Quality Laboratory taxonomic hierarchy. Reach A begins at the red buoy near river mile 239, marking the top of Hitt Island, and continues downstream for 3281 ft, which is 492 ft downstream of the Ottawa navigation light number 238.5. The surface area sampled was 0.29 m².

BENTHIC MACROINVERTEBRATES
[sp., species; A, Adults; LV, Larvae; P, Pupae; X, present; -, not found]

PHYLUM
	Class
		Order
			(Suborder)
				Family					Reach A
					Subfamily				9/8/98
						(Tribe)
							Taxon	Life stage	Quantitative	Qualitative

PORIFERA
				Spongillidae
							Spongillidae		-	X
PLATYHELMINTHES
	Turbellaria
							Turbellaria		-	X
NEMATODA
							Nematoda		28	-
MOLLUSCA
	Gastropoda
				Pleuroceridae
							Pleurocera sp.		-	X
				Ancylidae
							Ferrissia sp.		-	X
				Physidae
							Physella sp.		-	X
	Bivalvia
				Dreissenidae
							Dreissena polymorpha (Pallas)		-	X
				Corbiculidae
							Corbicula sp.		-	X
				Sphaeriidae
							Sphaeriidae		-	X
ANNELIDA
	Oligochaeta
				Naididae
							Naididae		196	-
				Tubificidae
							Tubificidae		-	X
ARTHROPODA
	Malacostraca
		Isopoda
				Asellidae
							Caecidotea sp.		-	X
		Amphipoda
				Hyalellidae
							Hyalella azteca (Saussure)		-	X
	Insecta
		Ephemeroptera
			(Furcatergalia)
				Leptohyphidae
							Tricorythodes sp.	LV	8	X
			(Pisciforma)
				Baetidae
							Labiobaetis sp.	LV	4	-
			(Setisura)
				Heptageniidae
							Stenonema mexicanum (Ulmer)	LV	6	X
		Odonata
			(Zygoptera)
				Calopterygidae
							Hetaerina sp.	LV	-	X
				Coenagrionidae
							Argia sp.	LV	-	X
		Hemiptera
			(Heteroptera)
					Corixinae
						(Corixini)
							Trichocorixa sp.	A	-	X
		Trichoptera
			(Spicipalpia)
				Hydroptilidae
							Hydroptilidae	P	4	-
					Hydroptilinae
							Hydroptila sp.	LV	24	-
							Hydroptila waubesiana Betten	P	8	-
			(Annulipalpia)
				Hydropsychidae
							Hydropsychidae	LV	140	-
					Hydropsychinae
							Hydropsyche bidens Ross	LV	8	-
							Hydropsyche bidens Ross/orris Ross	LV	57	X
							Hydropsyche orris Ross	LV	217	X
							Potamyia flava (Hagen)	LV	6	X
				Polycentropodidae
							Polycentropodidae	P	1	-
					Polycentropodinae
							Cyrnellus fraternus (Banks)	LV	59	X
		Coleoptera
			(Polyphaga)
				Elmidae
							Macronychus glabratus Say	LV	4	-
							Macronychus glabratus Say	A	-	X
		Diptera
			(Nematocera)
				Chironomidae
							Chironomidae	LV	2	-
							Chironomidae	P	4	-
					Chironominae
							Chironominae	P	36	X
						(Chironomini)
							Cryptochironomus sp.	LV	-	X
							Dicrotendipes sp.	LV	92	X
							Glyptotendipes sp.	LV	404	X
							Parachironomus sp.	LV	-	X
							Polypedilum sp.	LV	236	X
						(Tanytarsini)
							Rheotanytarsus sp.	LV	328	X
							Tanytarsus sp.	LV	-	X
					Orthocladiinae
							Orthocladiinae	LV	-	X
							Orthocladiinae	P	4	X
							Cricotopus/Orthocladius sp.	LV	128	X
							Eukiefferiella sp.	LV	-	X
							Nanocladius sp.	LV	32	-
							Orthocladius sp.	LV	24	-
					Tanypodinae
						(Pentaneurini)
							Ablabesmyia sp.	LV	4	X
				Tipulidae
					Limoniinae
							Limonia sp.	LV	-	X

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data