Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

New WQX 3.0 profiles are available at waterqualitydata.us/beta/. These profiles will contain recent USGS data added since March 11, 2024, which marks the beginning of limited accessibility for USGS data. Read more about the 3.0 profiles and associated changes here. This user interface only serves WQX2.2 profiles, which do NOT contain USGS data added after March 11, 2024.

WQP Home >  Providers >  STORET >  MHA_NATN >  MHA_NATN-TAT L04

Mahto Bay (Malnourie Bay) (MHA_NATN-TAT L04) site data in the Water Quality Portal

Data Provider: STORET (Learn more about Water Quality Portal Data Providers)

This reservoir site, maintained by the Three Affiliated Tribes: Mandan, Hidatsa, and Arikara Nation (identifier MHA_NATN), has the name "Mahto Bay (Malnourie Bay)" and has the identifier MHA_NATN-TAT L04. This site is in the watershed defined by the 8 digit Hydrologic Unit Code (HUC)10110101.

This site is located in Mercer County County, North Dakota at 47.5285170000 degrees latitude and -102.0972170000 degrees longitude using the datum WGS84. No horizontal location accuracy metadata is available.

To download the metadata about this site along with water quality data, go to the Portal Page and enter "MHA_NATN-TAT L04" into the "Site ID" box under Site Parameters

What other monitoring locations are upstream or downstream from this one?

Upstream and downstream locations

This map shows all Water Quality Portal stations that are 10 miles upstream (dashed dark blue) and 10 miles downstream (solid light blue) of this monitoring location (indicated by the large blue circle). The upstream and downstream functionality is provided by the Network Linked Data Index.

When were data collected at this location?

Periods of record for data characteristic groups

For a more detailed breakdown of data, go to the Monitoring Report at the EPA How's My Waterway Application
Characteristic Group Date Range*
Inorganics, Major, Metals 2001 - 2008
Inorganics, Major, Non-metals 2005 - 2008
Inorganics, Minor, Metals 2000 - 2008
Inorganics, Minor, Non-metals 2000 - 2008
Microbiological 2008 - 2008
Nutrient 2000 - 2008
Organics, Pesticide 2001 - 2004
Physical 2000 - 2008
*Date ranges may contain gap years

What other information is available for this location?

Detailed Metadata

For the definitions of the metadata elements, please go to the Water Quality Portal user guide

Location Metadata Value
OrganizationIdentifier MHA_NATN
OrganizationFormalName Three Affiliated Tribes: Mandan, Hidatsa, and Arikara Nation
MonitoringLocationIdentifier MHA_NATN-TAT L04
MonitoringLocationName Mahto Bay (Malnourie Bay)
MonitoringLocationTypeName Reservoir
HUCEightDigitCode 10110101
LatitudeMeasure 47.5285170000
LongitudeMeasure -102.0972170000
HorizontalCollectionMethodName GPS Code (Pseudo Range) Standard Position (SA Off)
HorizontalCoordinateReferenceSystemDatumName WGS84
CountryCode US
StateCode 38
CountyCode 057
ProviderName STORET