Watershed Topic Links
General Watersheds
EPA - Surf Your Watershed
PA Dept. of Environmental Protection: Your Watershed
Pennsylvanian Organization for Watersheds and Rivers
General Environmental
Environmental Information Center
River and Stream Links for Further Exploration
Water Chemistry
Creek Connections Water Chemistry Fact Sheets
City of Boulder Water Quality Monitoring

Beginner FAQ: Water Chemistry
Water Properties
 Water Basics
Water Science for Schools -USGS

 Macroinvertebrates
North American Benthological Society - Macroinvertebrate Images
Aquatic Macroinvertebrates Factsheets
Key to Aquatic Macroinvertebrates

New York State DEC- Macroinvertebrate Key (great pictures)
Aquatic Insect Resources (Links)
River Continuum Concept
Photographs of Aquatic Life
Aquatic Flies

Leaf Packets

Water Cycle
Water Science for Schools - USGS - Earth's Water
Watershed Atlas of the Allegheny River Watershed

Creek Connections Watershed Information

Fish
eNature.com Guide to Fish
PA Fishes (PA Fish and Boat Commission)

PA Endangered Species

Freshwater Mussels
Creek Connections Mussels of French Creek
Field Guide to Freshwater Mussels of the Midwest

PA Endangered Species

Freshwater Mussel Information

 Water Pollution / Threats
Association of State and Interstate Water Pollution Control
America's Clean Water Foundation
Acid Rain - EPA - Acid Rain Program

Water and Germs: Diseases and their Pathogens
Creek Connections Watershed Pollution Summary

EPA: "Polluted Runoff (Nonpoint Source Pollution)"
Freshwater Website: Water Pollution
Water Pollution in the Great Lakes
Clean Water Network
Hands on Experiments to Test for Acid Mine Drainage
US Geological Survey: "Mine Drainage"

Drinking Water
Pennsylvania Drinking Water - EPA Office of Water
EPA Office of Groundwater and Drinking Water

Pennsylvania's Cool Resource (DEP)
The National Drinking Water Clearinghouse
U.S. Environmental Protection Agency: Water Quality Criteria

Water Quality
Phytoplankton / Zooplankton
Plankton Key - with pictures

Invasive Species
Sea Grant National Aquatic Nuisance Species Clearinghouse
Exotic Species

 pH
Miami Museum of Science - The pH Factor
 Aquatic Plants / Algae
Aquatic Ecology Page - Algae
National Museum of History - Dept. of Botany - Algae

Indiana University - Diatoms

Cyanobacteria: Life Cycle and Ecology - UCatBerkley
Groundwater
The Groundwater Foundation
Center for Groundwater Studies: Groundwater Information

USGS Groundwater

Pennsylvania's Cool Resource (DEP)
 Birds of Marsh & Waterways
eNature.com Guide to Birds
PA Game Commission - Wildlife Notes

Aquatic Ecology Page - Birds
Clip Art and Photographs
US Fish and Wildlife Service: Image Library
US Forest Service Find-A-Photo
Streamside Mammals
PA Game Commission - Wildlife Notes
Animal Tracks Guides
Topographic Maps
Topo Map Basics
USGS Topographic Maps Home Pages
Reading Topographic Maps
Landforms on Topographic Maps

Online Topographic and Relief Maps
TopoZone
Pennsylvania Topography 3-D Relief Map
Global Topographic Data
Relief Global Slide

Topo Map Activities
Teaching with Topo: 25 Ideas for Educational Lessons
USGS Map Mysteries Activities
USGS-The Learning Web
Topo Bingo
Building a Topographic Model
How to Make a Topo Map
Map Reading Activity: Topography #1
Map Reading Activity: Topography #2

Ordering Topographic Maps
Pennsylvania Map Lists
USGS Maps Price List
USGS Maps Order Form

Wetlands
Wetlands in General
Environmental Protection Agency: Wetlands
Glossary of Wetland Terms
Living in Harmony with Wetlands
List of Various Wetland Links 
National Wildlife Federation - Wetlands

The Evergreen Project - Wetlands

National Wetlands Inventory Center


Wetlands Regulations
The Wetlands Regulation Center
Clean Water Act, Section 404
Federal Wetlands analysis, regulations, & news
PA Coastal Zone Mangement

Laws, Regulations, Executive Orders,
Guidance and Scientific Documents
EPA Wetlands
PA DCNR - Legal Counsel - Major Laws
P
ennsylvania Regulations and Policy