Classified for credit

Urban nature reserve along Lake Roland with trails and ranger programs — covers stream ecology, forest biology, and Baltimore watershed conservation.

North Dakota state park on Lake Sakakawea reservoir — Missouri River basin geography, prairie ecology, and Lewis and Clark historical context.

Kansas state park with spring-fed lake and ruins of an El Cuartelejo Pueblo site — covers High Plains ecology, hydrology, and Native American history.

Small Vermont state park with a spring-fed lake — supports ecology observation, freshwater biology, and outdoor PE.

Texas reservoir state park with 21-mile trailway — freshwater ecology, native wildlife, and physical geography of the post oak savanna region.

Vermont state park on Lake St. Catherine offering shoreline ecology, freshwater biology, and outdoor recreation with ranger-accessible natural areas.

Metropark nature center on Lake St. Clair — freshwater ecology, bird and fish identification, and Great Lakes shoreline habitat study.

Maine state park with lake, trails, and camping — supports ecology, freshwater biology, and outdoor education fieldwork.

Western Washington state park centered on a freshwater lake — limnology, Pacific Northwest forest ecology, and outdoor recreation study.

Minnesota Landscape Arboretum unit featuring tamarack bog and lake habitats — covers plant communities, wetland ecology, and native Minnesota species.

State park on a glacially formed lake in the White Mountains — ecology, freshwater biology, and New England geology in a developed outdoor setting.

Reservoir-centered Texas state park with hiking, birding, and fishing — covers freshwater ecology, wildlife habitat, and physical geography of the Blackland Prairie.

Oklahoma state park on Lake Texoma offering trails, wildlife habitat, and water recreation — supports freshwater ecology, geography, and outdoor PE.

South Dakota glacial prairie lake recreation area with wetland habitat — supports Great Plains ecology, migratory bird observation, and physical education.

Environmental education center on a forested lake supporting aquatic ecology, native species study, and outdoor science programs.

Oklahoma state park on a reservoir — supports field study of cross-timbers ecology, freshwater biology, and outdoor recreation science.

State park swim and recreation area on Lake Thunderbird — supports Oklahoma freshwater ecology, outdoor PE, and basic limnology.

Developed state park area on Lake Thunderbird — supports freshwater ecology, Oklahoma geology, and outdoor field study.

Lake Thunderbird State Park's Little Axe area offering lake access and woodland trails — covers Oklahoma cross-timbers ecology, freshwater biology, and outdoor recreation.

Remote NH/ME border refuge protecting boreal wetlands — field study of loon habitat, northern forest ecology, and watershed conservation.

South Dakota state recreation area on Lake Vermillion with trails, fishing, and wetland habitat — covers prairie lake ecology, South Dakota geography, and outdoor recreation.

Coastal plain lake park with a rare endemic fish ecosystem — covers freshwater ecology, biodiversity, and regional geology.

State park adjacent to Minidoka Dam on the Snake River — covers high-desert ecology, migratory bird habitat, and Bureau of Reclamation irrigation history.

Glacially formed lake park in southern Iowa with interpretive trails — freshwater ecology, glacial geology, and outdoor PE in a developed state park setting.