Water, bed sediment, and invertebrate tissue were sampled in streams from Butte to near Missoula, Montana (MT), as part of a long-term monitoring program within the Upper Clark Fork Basin. The sampling program was completed by the U.S. Geological Survey, in cooperation with the U.S. Environmental Protection Agency, to characterize aquatic resources in the Upper Clark Fork Basin and monitor trace elements associated with historical mining and smelting activities. Sampling sites were on the Clark Fork River and a subset of its tributaries. Water samples were collected periodically at 21 sites from October 2020 through September 2021. Bed-sediment and tissue samples were collected once at 13 sites in July 2021. Water-quality data included water-quality properties, concentrations of major ions, dissolved organic carbon, nitrogen (nitrate plus nitrite), trace elements, and suspended sediment. Bed-sediment data included trace element concentrations measured in the fine grained (less than 0.063 millimeter) fraction. Biological data included trace-element concentrations in whole-body tissue of selected aquatic benthic invertebrates. Water-quality, bed-sediment, and invertebrate tissue trace element data for sites in the Upper Clark Fork Basin were provided between October 2020 through September 2021.

Legacy mine waste from the Clark Fork River in Western Montana has contributed 100 million tons of tailings into the watershed between 1880 and 1982 (E.D. Andrews, Longitudinal dispersion of metals in the Clark Fork River, Montana, Lewis Publishers, 1987). Tailings deposited along the floodplain, streambanks and river channel continue to contribute metal contaminated material into the river in the form of metal-enriched particulate matter or seston, comprising a mixture of organic and inorganic materials (J.N. Moore and S.N. Luoma, Hazardous wastes from large-scale metal extraction: A case study. Environmental Science and Technology, v.24:1278-1285, 1990). Metal enriched seston poses a dietary exposure risk to filter-feeding macroinvertebrates [...]

Supporting water chemistry data and locational information from the article "Convergent recovery across western U.S. watersheds: Long-term monitoring reveals convergent patterns of recovery from mining contamination across four western U.S. watersheds" published in Freshwater Science, https://doi.org/10.1086/714575.
The information consists of 8 files providing supporting information on:

1. (SI) Supplemental information published with the main article, consisting of 4 figures: Fig. S1: Representative photographs; Fig S2: Stream discharge plots; Fig S3: Contributions of different metals to the cumulative criterion units (CCU) at impacted sites; and Fig. S4: Long-term changes in total macroinvertebrate abundance.
2. "SI-Western_Watersheds_Stream_Recovery.kml" Provides coordinates of study sites, and allows viewing site locations overlain on imagey of the watersheds for environmental context. Viewable in programs such as QGIS and Google Earth.

3. SI-assumptions for estimating metals exposures.pdf Supplemental Information on Methods for Estimating Metals Exposures and calculate cumulative criteria units (CCUs)
4. SI-Arkansas_R_CCU.xlsx Provides stream chemistry data and formulas used to calculate CCUs for the Arkansas River, Colorado study area.
5. SI-ClarkForkRiver-CCU.xlsx Provides stream chemistry data and formulas used to calculate CCUs for the Clark Fork River, Montana study area.
6. SI-Leviathan_CCU.xlsx Provides stream chemistry data and formulas used to calculate CCUs for the Leviathan Mine, California study area.
7. SI-BigDeerCreek.xlsx Provides stream chemistry data and formulas used to calculate CCUs for the Big Deer Creek, Idaho study area.
8. SI-Hydrological characteristics.xlsx. Flat file with flow statistics for the streams from all 4 study units matched with chemistry values.

Supporting water chemistry data and locational information from the article "Convergent recovery across western U.S. watersheds: Long-term monitoring reveals convergent patterns of recovery from mining contamination across four western U.S. watersheds" published in Freshwater Science, https://doi.org/10.1086/714575.
The information consists of 7 files providing supporting information on:

1. "SI-Western_Watersheds_Stream_Recovery.kml" Provides coordinates of study sites, and allows viewing site locations overlain on imagey of the watersheds for environmental context. Viewable in programs such as QGIS and Google Earth.

2. SI-assumptions for estimating metals exposures.pdf Supplemental Information on Methods for Estimating Metals Exposures and calculate cumulative criteria units (CCUs)
3. SI-Arkansas_R_CCU.xlsx Provides stream chemistry data and formulas used to calculate CCUs for the Arkansas River, Colorado study area.
4. SI-ClarkForkRiver-CCU.xlsx Provides stream chemistry data and formulas used to calculate CCUs for the Clark Fork River, Montana study area.
5. SI-Leviathan_CCU.xlsx Provides stream chemistry data and formulas used to calculate CCUs for the Leviathan Mine, California study area.
6. SI-BigDeerCreek.xlsx Provides stream chemistry data and formulas used to calculate CCUs for the Big Deer Creek, Idaho study area.
7. SI-Hydrological characteristics.xlsx. Flat file with flow statistics for the streams from all 4 study units matched with chemistry values.

Supporting water chemistry data and locational information from the article "Convergent recovery across western U.S. watersheds: Long-term monitoring reveals convergent patterns of recovery from mining contamination across four western U.S. watersheds" published in Freshwater Science, https://doi.org/10.1086/714575.
The information consists of 8 files providing supporting information on:

1. (SI) Supplemental information published with the main article, consisting of 4 figures: Fig. S1: Representative photographs; Fig S2: Stream discharge plots; Fig S3: Contributions of different metals to the cumulative criterion units (CCU) at impacted sites; and Fig. S4: Long-term changes in total macroinvertebrate abundance.
2. "SI-Western_Watersheds_Stream_Recovery.kml" Provides coordinates of study sites, and allows viewing site locations overlain on imagey of the watersheds for environmental context. Viewable in programs such as QGIS and Google Earth.

3. SI-assumptions for estimating metals exposures.pdf Supplemental Information on Methods for Estimating Metals Exposures and calculate cumulative criteria units (CCUs)
4. SI-Arkansas_R_CCU.xlsx Provides stream chemistry data and formulas used to calculate CCUs for the Arkansas River, Colorado study area.
5. SI-ClarkForkRiver-CCU.xlsx Provides stream chemistry data and formulas used to calculate CCUs for the Clark Fork River, Montana study area.
6. SI-Leviathan_CCU.xlsx Provides stream chemistry data and formulas used to calculate CCUs for the Leviathan Mine, California study area.
7. SI-BigDeerCreek.xlsx Provides stream chemistry data and formulas used to calculate CCUs for the Big Deer Creek, Idaho study area.
8. SI-Hydrological characteristics.xlsx. Flat file with flow statistics for the streams from all 4 study units matched with chemistry values.

Water, bed sediment, and biota were sampled in selected streams from Butte to near Missoula, Montana, as part of a monitoring program in the upper Clark Fork Basin of western Montana. The sampling program was led by the U.S. Geological Survey (USGS), in cooperation with the U.S. Environmental Protection Agency.