The Montana bureau of Mines and Geology (MBMG) is a water-level and water-quality data provider to the national Groundwater surveillance Network (NGWMN). The MBMG was among the early stage NGWMN pilot studies and also was among the first agencies to provide data to the NGWMN data portal. About 1/4 that Montana"s 1,000 groundwater security sites are had in the NGWMN. Sites consisted of in the water-level network have data gathered at the very least quarterly. Sites in the water-quality network space sampled approximately every 5 years. MBMG has been a part the the Network since 2015.

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MBMG gives water-level and water-quality data native the Alluvial aquifers, Sand and gravel aquifers (glacial regions), north Rocky hills Intermontane basins aquifer system, reduced Tertiary aquifer, upper Cretaceous aquifer, reduced Cretaceous aquifer, and also Paleozoic aquifers.

NGWMN Products:

NGWMN Montana Pilot Report

NGWMN Projects:

Initial task to end up being a NGWMN data provider.

Project to assistance maintenance of database connections to NGWMN portal.

Project to to fill site-information gaps and also perform well maintain work. Inspection grade general practitioners locations and also land-surface altitudes determined at 50 sites. Well maintenance job-related to install steel protective casings at 15 wells v exposed PVS casing.

Project to perform well rehabilitation and also repair on 3 wells in Northwest Montana.

Project is to provide persistent data services for 2 years. The objective is come ensure the NGWMN data is up to date and available.

Project is come drill 2 wells to change an existing shallow NGWMN site with a well nest in the northern Rocky hills Intermontane basin aquifer close to West Yellowstone.

NGWMN Presentations:

December 2016 presentation come SOGW

Site an option and Classification

Site Selection

The about 1,000 wells in the Montana network were reviewed to recognize those that have actually a water-level document of at the very least 5 years and are perfect in a primary aquifer. Climate the water-level record and also well setups were then evaluated to make a sub-network determination. Finally, the surveillance frequency was used to divide the sites together either tendency or surveillance. This review and also reclassification established 227 wells because that inclusion in the NGWMN. The NGWMN Framework Document and NGWMN Tip Sheets were provided to overview the an option process. 

A full of 856 major Aquifer wells had 5 or more years that water-level data and also a surveillance frequency that at the very least quarterly. The NGWMN wells to be selected indigenous this set of wells. Last NGWMN candidates were selected from this team after considering the aquifer extent, groundwater breakthrough (indicated through the variety of production wells), the groundwater flow system, and also the security well density. 

Site Classification

The MBMG evaluated each well"s hydrograph in conjunction with neighborhood hydrogeologic and also land-use conditions to assign the candidate come the Background, suspected Changes, or Documented alters subnetworks. The hydrographs from many Montana network wells showed small or no anthropogenic effect and also were assigned come the background subnetwork. Hydrographs the showed recognized anthropogenic results (assigned come the Documented changes subnetwork) consisted of signals documenting: 

Seasonal irrigation recharge - mostly in the irrigated intermontane basins and eastern alluvial aquifers.Seasonal irrigation withdrawals - greatly in the irrigated intermontane basins and also buried sand and also gravel glacial aquifers.Long-term depletion - in your ar in the Fox Hills-Hell Creek aquifer of the upper Cretaceous aquifer system in eastern Montana.

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The tables below summarize the early stage site an option and category used for each major aquifer. An ext details ~ above the an option and group for every aquifer is in the final job report.

Water-Level sites in the NGWMNPrincipal Aquifer

 Trend wells

Background wells

Suspected transforms wells

Documented changes wells

Northern Rocky hills Intermontane containers aquifer systems 10983026
Alluvial aquifers151500
Sand and also gravel aquifers (glacial regions)9801
Lower Tertiary aquifers373151
Upper Cretaceous aquifers464402
Lower Cretaceous aquifers7700
Paleozoic aquifers4400

Principal AquiferNumber of security wellsNumber of background wells

Water-Quality website in the NGWMN

Northern Rocky hills Intermontane basins aquifer equipment 2828
Alluvial aquifers11
Sand and also gravel aquifers (glacial regions)44
Lower Tertiary aquifers1212
Upper Cretaceous aquifers88
Lower Cretaceous aquifers44
Paleozoic aquifers11