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This creek originates in York County, PA and flows through the city of York on its way to the Susquehanna River. The creek has the nickname "the river of stench" in certain parts of York County. The upper reach of the creek is a beautiful heritage trout stream. The middle reach of the creek is biologically impaired due to a paper mill's effluent and certain industry in York, PA. The biology of Codorus Creek starts to improve in the lower reaches, just before emptying into the Susquehanna River

Research on Codorus Creek was performed by Michael Burrell and Jeff Erikson

General chemical factors:

Total Hardness (mg/L): 174

Alkalinity (mg/L): 121

Nitrate-Nitrogen (mg/L): 1

Phosphorus (mg/L): 0.6

Conductivity (uS/cm): 280

Chemical Oxygen Demand (mg/L): 37

List of Insects caught in the riffle regions:

Coleoptera

Elmidae Ancyronyx, Dubiraphia, Optioservus, and Stenelmis

Psephenidae Psephenus

Diptera

Chironomidae

Empididae Hemerodromia

Simuliidae Simulium

Tipulidae Antocha and Tipula

Ephemeroptera

Baetidae Acentrella, Baetis and Centroptilum

Canidae Caenis

Ephemerellidae Ephemerella

Heptageniidae Leucrocuta, Stenonema, and Stenacron

Tricorythidae Tricorythodes

Lepidoptera

Pyralidae Petrophila

Megaloptera

Sialidae Sialis

Odonata

Coenagrionidae Argia

Plecoptera

Perlidae Perlesta

Taeniopterygidae Strophopteryx

Trichoptera

Hydropsychidae Ceratopsyche, Cheumatopsyche,and Hydropsyche

Philopotamidae Chimarra

Psycomyiidae Psychomyia