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In the section of the river above the dam builds up with sediment, making the dam shallower. High water flow causes scouring and the transport of sediment and associated nutrients over the dam. On this other side of the dam phosphorus mobilizes in reaction with salt water. Further down the river seagrass beds grow on the Susquehanna flats. — Conowingo Dam Reservoir and Susquehanna Flats…

The Northern Great Plains Network consists of 13 park units located in the Dakotas, Nebraska and eastern Wyoming. This network consists of 11 ecoregions. — Northern Great Plains Network National Park…

Ranking tributaries by water quality, then by diffuse nitrogen sources can help to determine which watersheds are high priority. High priority watersheds are those responsible for proportionally more nutrient and sediment inputs to receiving waters than other watersheds. — Steps to Identifying High Priority Tributaries

The timing of tropical storms and hurricanes can have major impacts on the life histories of Chesapeake Bay flora and fauna. Changes in water salinity can cause early spawning in some species, such as the blue crab, and increased sediment can cause widespread die-off of seagrasses. — Storm Timing and Impacts on Chesapeake Bay Flora…

This diagram illustrates the main threats from hurricanes and tropical storms. The counterclockwise circulation of winds in the Northern Hemisphere causes maximum winds and maximum storm surges. — Threats from Hurricanes and Tropical Storms

A diagram illustrates the flow capacity for the Mississippi River in thousands of cubic feet per second, based on the 1956 project design flood. The Ohio river is the 200,000 square-mile eastern drainage of the Mississippi River watershed. Diagram from — Flow Capacity for the Mississippi River

Human impacts to Fort Union Trading Post include loss of native grass species, invasive plants and reduced river flow. Methods such as prescribed fire and the planting of native species have been used to restore and protect the site. — Fort Union Trading Post National Historic Site…

Some of the most common threats to the national parks ecosystems include those to quality of air, quality and quantity of available water, and the parks native species. Prescribed fire is used to prevent uncontrolled forest fires and to reduce the growth of nonnative species. — Generic Resources and Threats to the Northern…

While Jewel Cave is currently in pristine condition there are several threats that could potential damage this site. These threats include the pollution of ground water that seeps into the cave at various points and visitor impacts. — Jewel Cave National Monument Threats and Features

While industrialization and urbanization have had a negative environmental impact on the Ohio River today several organizations are working together to combined economic and development opportunities with recreational and ecosystem goals. Diagram from — Main Threats and Key Features of the Ohio River…

A conceptual diagram illustrates the main threats and key features of the Upper-Mississippi River Sub-Basin. Some of these threats include harmful algal blooms, power plants and urban centers. Diagram from — Main Threats and Key Features of the Upper…

The Niobrara River is where six major biomes converge to form a rich diversity of flora and fauna. Threats to the river arise from fire exclusion leading to the expansion of ponderosa pine into grassland area, changes in microclimates, the spread of invasive plants and the high volume of visitors during peak periods. — Niobrara National Scenic River Resources and…

A map shows that land use in the Ohio River Basin is dominated by developed, forested and cropland areas. Diagram from — Ohio River Basin Land Use

A conceptual diagram illustrates the dates and locations of different Mississippi River Report Card workshops. The workshop process is used to bring different groups together to strengthen the report card and promote broad prospectives, dialogue and collaboration. — Mississippi River Report Card Workshop Timeline

The diagram lists potential indicators for the Ohio River Basin that were generated at the workshop. The goals listed in this diagram are representative of the things people value in the Ohio River Basin watershed. — Potential Indicators for the Ohio River Basin

The Lower Mississippi River Basin supports a diversity of uses, dependent upon both natural and human engineered systems. This conceptual diagram illustrates the main threats and key features of the river basin. — Threats and Features of the Lower Mississippi…

Chilika Lake Pollution Pressure

Chilika Lake Tourism Pressure

Several connections were made at the Lower Mississippi River Basin workshops. These connections will be used to develop a basin-wide report card for the watershed. — Lower Mississippi Workshop Connections

The Chesapeake Bay watershed received an above average annual amount of precipitation in 2013. This accompanied degrading conditions in some regions of the Chesapeake Bay watershed and improving conditions in others. — Chesapeake Bay Watershed Percipitation Map 2013

Unsustainable fishing and aquaculture practices have put pressure on the Chilika Lake ecosystem. Dead fish thrown back into the water contaminate the lake while shrimp pens trap sediment and kill juvenile fish. — Chilika Lake Fishing and Aquaculture Pressures

Chilika Lake Sedimentation

Native to India, introduced to Hawaii Island in 1883 (via Jamaica, where it was also introduced), then introduced to Maui, Molokai, and Oahu; none were introduced on the island of Kauai. Mongoose were imported by the sugar industry to control rats in cane fields. This infamous mistake was made without much knowledge about mongoose. Mongoose, which are active during the day, did not control the rats because the rats are primarily active at night. — Herpestes javanicus (Small Asian Mongoose)

Improvements in water quality can be counteracted by changes in nutrient sources and land-use practices. Increased nutrient loads from stormwater and intensified agriculture often overwhelm the positive effects of best management practices. — Counteracting Factors Impacting Best Management…

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