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Modified Version of NHDV1 for Inland Stream Assessment for the Conterminous United States (Figure 2)
Stream reaches and local and network catchments and buffers (modified from Wang et al. 2011).
Most severe disturbances in the Central Mississippi River States associated with stream reaches being scored as having high or very high risk of habitat degradation. Disturbances are grouped into large groups (fragmentation by dams; nutrient and sediment pollution; human population; road length and crossings; water withdrawals; urban land use; agricultural land use; mines and impervious surface cover) within the four spatial scales (local catchment, network catchment, local buffer, and network buffer). Only disturbance groups that have greater than 5% of stream length in a given category are represented in this figure. Note that not all disturbance categories are available for each spatial scale; buffers have only...
Most severe disturbances in the Southwestern States associated with stream reaches being scored as having high or very high risk of habitat degradation. Disturbances are grouped into large groups (fragmentation by dams; nutrient and sediment pollution; human population; road length and crossings; water withdrawals; urban land use; agricultural land use; mines and impervious surface cover) within the four spatial scales (local catchment, network catchment, local buffer, and network buffer). Only disturbance groups that have greater than 5% of stream length in a given category are represented in this figure. Note that not all disturbance categories are available for each spatial scale; buffers have only urban land...
Spatial scales to which data were attributed for Hawaii inland stream assessment. Units include local catchments (A), network catchments (B), and downstream main channel catchments (C).
This interactive figure summarizes the risk of fish habitat degradation for both perennial and intermittent waters as defined by the National Hydrography Dataset Plus Version 1. Future assessment enhancements will include a map of scores for only perennial streams in the U.S. The currently selected tab shows data from the inland assessment of streams for the contiguous United States. (a) Relative condition of fish habitat in streams. Stream summaries represent percentage of total stream length in each condition class. (b) Map showing risk of fish habitat degradation. The default view shows all stream condition classes. User may change map display by selecting a bar in (a), resulting in a display of the selected...
Most severe disturbances in the Southern Plains States associated with stream reaches being scored as having high or very high risk of habitat degradation. Disturbances are grouped into large groups (fragmentation by dams; nutrient and sediment pollution; human population; road length and crossings; water withdrawals; urban land use; agricultural land use; mines and impervious surface cover) within the four spatial scales (local catchment, network catchment, local buffer, and network buffer). Only disturbance groups that have greater than 5% of stream length in a given category are represented in this figure. Note that not all disturbance categories are available for each spatial scale; buffers have only urban...
This interactive figure summarizes the risk of fish habitat degradation. The currently selected tab shows data from the assessment of streams for Alaska. (a) Relative condition of fish habitat in streams. Stream summaries represent percentage of HUC12 area in each condition class. (b) Map showing risk of fish habitat degradation. The default view shows all stream condition classes. User may change map display by selecting a bar in (a), resulting in a display of the selected condition class in (b). Please see How to Read this Report for important information about strengths and limitations of these findings. Click here to download scores from the Alaska assessment of streams.
Spatial units (HUC-12s and local catchments) to which data were attributed for the Alaska stream assessment. A HUC-12 contains multiple local catchments.
Spatial units used to analyze the effects of variables on estuaries.
Steps for 2015 national assessment of stream fish habitats.
This interactive figure summarizes the risk of fish habitat degradation. The currently selected tab shows data from the northern Gulf of Mexico estuary assessment. (a) Relative condition of fish habitat in estuaries. Estuary summaries represent percentage of total estuary length in each condition class. (b) Map showing risk of fish habitat degradation. The default view shows all estuary condition classes. User may change map display by selecting a bar in (a), resulting in a display of the selected condition class in (b). Please see How to Read this Report for important information about strengths and limitations of these findings. Click here to download scores from the Northern Gulf of Mexico Regional Estuary...
Steps for 2015 hawaii assessment of stream fish habitats.
Association between fish indicator (y-axis) and human landscape factor (x-axis). Note that the threshold point occurs at the boundary of condition classes 5 and 4, and the plateau point occurs at the boundary of condition classes 1 and 2.
This interactive figure summarizes the risk of fish habitat degradation for both perennial and intermittent waters as defined by the National Hydrography Dataset. The currently selected tab shows data from the assessment of streams for Hawaii. (a) Relative condition of fish habitat in streams. Stream summaries represent percentage of total stream length in each condition class. (b) Map showing risk of fish habitat degradation. The default view shows all stream condition classes. User may change map display by selecting a bar in (a), resulting in a display of the selected condition class in (b). Please see How to Read this Report for important information about strengths and limitations of these findings....
Different assessment regions of Alaska.
This interactive figure summarizes the risk of fish habitat degradation. The currently selected tab shows data from the national estuary assessment. (a) Relative condition of fish habitat in estuaries. Estuary summaries represent percentage of total estuary area in each condition class. (b) Map showing risk of fish habitat degradation. The default view shows all estuary condition classes. User may change map display by selecting a bar in (a), resulting in a display of the selected condition class in (b). Please see How to Read this Report for important information about strengths and limitations of these findings. Click here to download scores from the national estuary assessment.
Most severe disturbances in the Pacific Coast States associated with stream reaches being scored as having high or very high risk of habitat degradation. Disturbances are grouped into large groups (fragmentation by dams; nutrient and sediment pollution; human population; road length and crossings; water withdrawals; urban land use; agricultural land use; mines and impervious surface cover) within the four spatial scales (local catchment, network catchment, local buffer, and network buffer). Only disturbance groups that have greater than 5% of stream length in a given category are represented in this figure. Note that not all disturbance categories are available for each spatial scale; buffers have only urban land...
(a) A demonstration of methodology used to generate cumulative habitat condition index (CHCI) scores from habitat condition indices (HCI) for stream reaches. The minimum HCI score generated for a given stream reach is assumed to reflect that stream reach’s maximum biological potential, and therefore serves as the CHCI for that stream reach. (b) Risk of current habitat degradation scores for stream reaches mapped to local catchments based off data in (a).
Steps used for the 2015 Regional Estuary Assessment for the Northern Gulf of Mexico
Nine large ecoregions of the conterminous United States used to select fish metrics and conduct the 2015 condition assessment of stream habitats.
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