Peak-flow frequency analyses for selected streamgages in and near Powell County, Montana, based on data through water year 2019

The USGS Wyoming-Montana Water Science Center (WY–MT WSC) completed a report (Sando and McCarthy, 2018) documenting methods for peak-flow frequency analysis following implementation of the Bulletin 17C guidelines. The methods are used to provide estimates of peak-flow quantiles for 66.7-, 50-, 42.9-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exceedance probabilities (AEPs) for selected streamgages operated by the WY–MT WSC. This data release presents peak-flow frequency analyses for selected streamgages in and near Powell County, Montana, that were based on methods described by Sando and McCarthy (2018).

Data and Resources

Field Value
accessLevel public
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identifier USGS:5fe8e404d34ea5387deca3c7
metadata_type geospatial
modified 20210708
old-spatial -113.7563, 46.2789, -112.7167, 47.2101
publisher U.S. Geological Survey
publisher_hierarchy Department of the Interior > U.S. Geological Survey
resource-type Dataset
source_datajson_identifier true
source_hash 25e86efbf32cbc6d370c127a229c6ccbdcb76770
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spatial {"type": "Polygon", "coordinates": [[[-113.7563, 46.2789], [-113.7563, 47.2101], [ -112.7167, 47.2101], [ -112.7167, 46.2789], [-113.7563, 46.2789]]]}
theme {geospatial}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • annual-exceedance-probability
  • blackfoot
  • ckan
  • computational-methods
  • floods
  • geo
  • geoss
  • hazard-preparedness
  • hazards
  • hydrologic-processes
  • hydrology
  • inlandwaters
  • land
  • montana
  • national
  • north-america
  • peak-flow-frequency
  • powell-county
  • statistical-analysis
  • stream-gage-measurement
  • streamflow
  • time-series-analysis
  • united-states
  • upper-clark-fork
  • usgs-5fe8e404d34ea5387deca3c7
  • usgs-cc-natural-hazards
  • watershed-management
isopen False
license_id notspecified
license_title License not specified
maintainer Daniel Armstrong
maintainer_email darmstrong@usgs.gov
metadata_created 2025-11-20T10:14:09.579190
metadata_modified 2025-11-20T10:14:09.579194
notes The USGS Wyoming-Montana Water Science Center (WY–MT WSC) completed a report (Sando and McCarthy, 2018) documenting methods for peak-flow frequency analysis following implementation of the Bulletin 17C guidelines. The methods are used to provide estimates of peak-flow quantiles for 66.7-, 50-, 42.9-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exceedance probabilities (AEPs) for selected streamgages operated by the WY–MT WSC. This data release presents peak-flow frequency analyses for selected streamgages in and near Powell County, Montana, that were based on methods described by Sando and McCarthy (2018).
num_resources 2
num_tags 29
title Peak-flow frequency analyses for selected streamgages in and near Powell County, Montana, based on data through water year 2019