View In:   ArcGIS Online Map Viewer

Name: Biomonitoring Subwatersheds (2016-2021; MCDEP)

Display Field: BENTHIC_NAME

Type: Feature Layer

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Description: Tributary catchment delineations defined by the Montgomery County Department of Environmental Protection and used to visualize stream health generated from the results of 2016 - 2021 countywide stream biological monitoring. A cooperative biological monitoring program was initiated by Montgomery County Department of Environmental Protection (DEP) and Montgomery Parks in 1994 to assess countywide stream conditions over time. Results from the 1994 - 2000 were published as part of the Countywide Stream Protection Strategy (CSPS). More recent results (2011 - 2015 and 2016 - 2021) have been shared via an interactive map hosted online by DEP. Montgomery County agencies apply stream health data to focus watershed protection efforts and support regulatory compliance, including evaluations of environmental protection needs and impacts for master plans, development review and regulatory processes, identifying land acquisition and protection priorities, and achieving federal and state water quality standards and permit requirements. Stream health is measured using a Stream Condition Index which represents a conglomerate of data. Specifically, results from two biological community assemblages, the Benthic Index of Biotic Integrity (BIBI) and the Fish Index of Biotic Integrity (FIBI) (when available), are normalized as percentages and averaged to create a Combined Index of Biotic Integrity (CIBI). CIBIs across multiple biological monitoring stations within a given tributary subwatershed in the given time band are then combined to generate a color-coded polygon representing Excellent (89-100%; Blue), Good (64-88%; Green), Fair (42-63%; Yellow), and Poor (0-41%; Red) health. This data layer is for internal use and screening purposes only and represents monitoring subwatersheds established by DEP and their associated stream health from 2016-2021. Contact MCDEP to inquire about data interpretation and request older monitoring results

Service Item Id: 0f158e8828e644e8ab9a3c273999d93f

Copyright Text: Montgomery County Department of Environmental Protection (DEP)

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ID: No stream monitoring data available for this area. Area streams not sampleable.
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ID: No stream monitoring data available for this area. Drains to stream outside of County boundary.
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