Welcome to the Montana Clean Water Act Information Center. The Center conveys information about the quality of Montana's rivers, streams, lakes and wetlands in relation to Montana's Water Quality Standards. Specifically, it displays the results of water quality assessments made on the basis of available water monitoring data, and tracks the status of Total Maximum Daily Loads (TMDLs). This site is not intended as a means of accessing water quality monitoring field data.
Search Montana's 305(b)/303(d) Water Quality Assessment Database
Step 1
Select a Year to Investigate
Year
2000
2002
2004
2006
Step 2
Select ONE Filter Below
Waterbody Name (Type then press Enter)
TMDL Planning Area
<- TMDL Planning Area ->
Beaver
Beaverhead
Belt
Benton Lake
Big & Little Dry
Big Creek (Columbia)
Big Creek (Yellowstone)
Big Sandy - Sage
Big Springs
Bighorn Lake - Shoshone
Bitterroot
Bitterroot Headwaters
Blackfoot Headwaters
Bobtail Creek
Boulder
Boulder - Big Timber
Bullwhacker - Dog
Canyon Ferry
Careless Creek
Clark Fork - Drummond
Clark Fork River
Clarks Fork Yellowstone
Cooke City
Cut Bank - Two Medicine
Dearborn
Deep Creek
East Gallatin
Elk Creek
Fisher
Flathead - Stillwater
Flathead Headwaters
Flathead Lake
Flatwillow - Box Elder
Flint
Fort Peck Area Tributaries
Grave Creek
Holter
Judith - Arrow
Kootenai
Lake Basin - Spidel
Lake Helena
Landusky
Little Blackfoot
Little Missouri
Lone Tree Creek
Lower Big Hole
Lower Blackfoot
Lower Clark Fork Tributaries
Lower Flathead
Lower Gallatin
Lower Jefferson
Lower Madison
Lower Milk - Rock
Lower Missouri
Lower Musselshell
Lower Red Rock
Lower Yellowstone
Marias - Willow
Middle Big Hole
Middle Blackfoot
Middle Clark Fork Tributaries
Middle Madison
Middle Milk & Tributaries
Middle Yellowstone Tributaries
Missouri Cascade
Missouri Choteau
Missouri River
Nevada Creek
Ninemile
North Fork Big Hole
Noxon Reservoir
O` Fallon
Paradise
Powder
Prospect Creek
Redwater
Rock
Rock Creek - Red Lodge
Rosebud
Ruby
Shields
Smith
St. Regis
Stillwater - Columbus
Sun
Swan
Teton
Thompson
Tobacco
Tongue
Upper Big Hole
Upper Clark Fork
Upper Gallatin
Upper Jefferson
Upper Lolo
Upper Madison
Upper Milk
Upper Red Rock
Upper/Middle Musselshell
Yaak
Yellowstone - Lower Bighorn
Yellowstone - Sweet Grass
Yellowstone River
County
<- County ->
BEAVERHEAD CO
BIG HORN CO
BLAINE CO
BROADWATER CO
CARBON CO
CARTER CO
CASCADE CO
CHOUTEAU CO
CUSTER CO
DANIELS CO
DAWSON CO
DEER LODGE CO
FALLON CO
FERGUS CO
FLATHEAD CO
GALLATIN CO
GARFIELD CO
GLACIER CO
GOLDEN VALLEY CO
GRANITE CO
HILL CO
JEFFERSON CO
JUDITH BASIN CO
LAKE CO
LEWIS AND CLARK CO
LIBERTY CO
LINCOLN CO
MADISON CO
MC CONE CO
MEAGHER CO
MINERAL CO
MISSOULA CO
MUSSELSHELL CO
PARK CO
PETROLEUM CO
PHILLIPS CO
PONDERA CO
POWDER RIVER CO
POWELL CO
PRAIRIE CO
RAVALLI CO
RICHLAND CO
ROOSEVELT CO
ROSEBUD CO
SANDERS CO
SHERIDAN CO
SILVER BOW CO
STILLWATER CO
SWEET GRASS CO
TETON CO
TOOLE CO
TREASURE CO
VALLEY CO
WHEATLAND CO
WIBAUX CO
YELLOWSTONE CO
YELLOWSTONE NATIONAL PARK
4th Field HUC
<- HUC ->
10010002 - St. Mary
10020001 - Red Rock
10020002 - Beaverhead
10020003 - Ruby
10020004 - Big Hole
10020005 - Jefferson
10020006 - Boulder
10020007 - Madison
10020008 - Gallatin
10030101 - Upper Missouri
10030102 - Upper Missouri-Dearborn
10030103 - Smith
10030104 - Sun
10030105 - Belt
10030201 - Two Medicine
10030202 - Cut Bank
10030203 - Marias
10030204 - Willow
10030205 - Teton
10040101 - Bullwhacker-Dog
10040102 - Arrow
10040103 - Judith
10040104 - Fort Peck Reservoir
10040105 - Big Dry
10040106 - Little Dry
10040201 - Upper Musselshell
10040202 - Middle Musselshell
10040203 - Flatwillow
10040204 - Box Elder
10040205 - Lower Musselshell
10050002 - Upper Milk
10050004 - Middle Milk
10050005 - Big Sandy
10050006 - Sage
10050007 - Lodge
10050008 - Battle
10050009 - Peoples
10050010 - Cottonwood
10050011 - Whitewater
10050012 - Lower Milk
10050013 - Frenchman
10050014 - Beaver
10050015 - Rock
10050016 - Porcupine
10060001 - Prarie Elk-Wolf
10060002 - Redwater
10060003 - Poplar
10060005 - Charlie-Little Muddy
10060006 - Big Muddy
10070001 - Yellowstone Headwaters
10070002 - Upper Yellowstone
10070003 - Shields
10070004 - Upper Yellowstone-Lake Basin
10070005 - Stillwater
10070006 - Clarks Fork Yellowstone
10070007 - Upper Yellowstone-Pompeys Pillar
10070008 - Pryor
10080010 - Big Horn Lake
10080015 - Lower Bighorn
10090101 - Upper Tongue
10090102 - Lower Tongue
10090207 - Middle Powder
10090208 - Little Powder
10090209 - Lower Powder
10090210 - Mizpah
10100001 - Lower Yellowstone-Sunday
10100002 - Big Porcupine
10100003 - Rosebud
10100004 - Lower Yellowstone
10100005 - O'Fallon
10110201 - Upper Little Missouri
10110202 - Boxelder
10110204 - Beaver
17010101 - Upper Kootenai
17010102 - Fisher
17010103 - Yaak
17010201 - Upper Clark Fork
17010202 - Flint-Rock
17010203 - Blackfoot
17010204 - Middle Clark Fork
17010205 - Bitterroot
17010206 - North Fork Flathead
17010207 - Middle Fork Flathead
17010208 - Flathead Lake
17010209 - South Fork Flathead
17010210 - Stillwater
17010211 - Swan
17010212 - Lower Flathead
17010213 - Lower Clark Fork
Water Quality Category
<- WQCat ->
1
2
2A
2B
3
4A
4C
5
Designated Uses
<- Uses ->
Agricultural
Aquatic Life
Cold Water Fishery
Drinking Water
Industrial
Primary Contact Recreation
Warm Water Fishery
Probable Causes
<- Causes ->
Alteration in stream-side or littoral vegetative covers
Alterations in wetland habitats
Aluminum
Ammonia (Total)
Ammonia (Un-ionized)
Antimony
Aquatic Plants - Native
Arsenic
Barium
Benthic-Macroinvertebrate Bioassessments
Beryllium
BOD, Biochemical oxygen demand
Bottom Deposits
Cadmium
Cause Unknown
Chloride
Chlorophyll-a
Chromium (total)
Cobalt
Combined Biota/Habitat Bioassessments
Copper
Cyanide
DDE
DDT
Dissolved Gas Supersaturation
Endosulfan
Endrin aldehyde
Escherichia coli
Excess Algal Growth
Fecal Coliform
Fish-Passage Barrier
Habitat Assessment (Streams)
High Flow Regime
Iron
Lead
Low flow alterations
Manganese
Mercury
Mercury in Water Column
Nickel
Nitrate/Nitrite (Nitrite + Nitrate as N)
Nitrates
Nitrogen (Total)
Nitrogen, Nitrate
Nonnative Fish, Shellfish, or Zooplankton
Nutrient/Eutrophication Biological Indicators
Oil and Grease
Organic Enrichment (Sewage) Biological Indicators
Other
Other anthropogenic substrate alterations
Other flow regime alterations
Oxygen, Dissolved
PCB in Water Column
Pentachlorobenzene
pH
Phosphate
Phosphorus (Total)
Physical substrate habitat alterations
Polychlorinated biphenyls
Polycyclic Aromatic Hydrocarbons (PAHs) (Aquatic Ecosystems)
Salinity
Sedimentation/Siltation
Selenium
Silver
Sodium
Solids (Suspended/Bedload)
Specific Conductance
Sulfates
Temperature, water
Thallium
Total Dissolved Solids
Total Kjehldahl Nitrogen (TKN)
Total Suspended Solids (TSS)
Turbidity
Uranium
Zinc
Probable Sources
<- Sources ->
Above Ground Storage Tank Leaks (Tank Farms)
Acid Mine Drainage
Agriculture
Animal Feeding Operations (NPS)
Aquaculture (Permitted)
Atmospheric Depositon - Nitrogen
Atmospheric Depositon - Toxics
Baseflow Depletion from Groundwater Withdrawals
Channel Erosion/Incision from Upstream Hydromodifications
Channelization
Coal Mining
Construction Stormwater Discharge (Permitted)
Contaminated Sediments
Crop Production (Crop Land or Dry Land)
Crop Production with Subsurface Drainage
Dam Construction (Other than Upstream Flood Control Projects)
Dam or Impoundment
Discharges from Municipal Separate Storm Sewer Systems (MS4)
Dredge Mining
Drought-related Impacts
Erosion from Derelict Land (Barren Land)
Flow Alterations from Water Diversions
Forest Roads (Road Construction and Use)
Freshettes or Major Flooding
Golf Courses
Grazing in Riparian or Shoreline Zones
Habitat Modification - other than Hydromodification
Hardrock Mining Discharges (Permitted)
Heap-leach Extraction Mining
Highway/Road/Bridge Runoff (Non-construction Related)
Highways, Roads, Bridges, Infrasturcture (New Construction)
Historic Bottom Deposits (Not Sediment)
Hydrostructure Impacts on Fish Passage
Impacts from Abandoned Mine Lands (Inactive)
Impacts from Hydrostructure Flow Regulation/modification
Impacts from Resort Areas (Winter and Non-winter Resorts)
Inappropriate Waste Disposal
Industrial Point Source Discharge
Industrial/Commercial Site Stormwater Discharge (Permittted)
Internal Nutrient Recycling
Irrigated Crop Production
Livestock (Grazing or Feeding Operations)
Loss of Riparian Habitat
Low Water Crossing
Managed Pasture Grazing
Mill Tailings
Mine Tailings
Municipal (Urbanized High Density Area)
Municipal Point Source Discharges
Natural Sources
Non-irrigated Crop Production
On-site Treatment Systems (Septic Systems and Similar Decencentralized Systems)
Open Pit Mining
Other Recreational Pollution Sources
Permitted Runoff from Confined Animal Feeding Operations (CAFOs)
Petroleum/natural Gas Activities
Petroleum/natural Gas Production Activities (Permitted)
Pipeline Breaks
Placer Mining
Post-development Erosion and Sedimentation
Rangeland Grazing
Residential Districts
Sediment Resuspension (Clean Sediment)
Sediment Resuspension (Contaminated Sediment)
Septage Disposal
Silviculture Activities
Silviculture Harvesting
Site Clearance (Land Development or Redevelopment)
Source Unknown
Sources Outside State Juristiction or Borders
Spills from Trucks or Trains
Streambank Modifications/destablization
Subsurface (Hardrock) Minining
Surface Mining
Transfer of Water from an Outside Watershed
Unspecified Unpaved Road or Trail
Unspecified Urban Stormwater
Upstream Impoundments (e.g., Pl-566 NRCS Structures)
Upstream Source
Upstream/Dowstream Source
Watershed Runoff following Forest Fire
Wet Weather Discharges (Non-Point Source)
Wet Weather Discharges (Point Source and Combination of Stormwater, SSO or CSO)
Yard Maintenance
305(b)/303(d) Information
Water Quality Reports
2006
2004
2002
2000
1998
1996
Public Comment
View FINAL 305(b)/303(d) Water Quality Report
Comment on DRAFT report
-
The comment period ended 11/7/2006 at 5 PM
Related Information
Federal Clean Water Act
Montana Water Quality Laws
Montana DEQ Water Quality Information
Data Management
Quality Assurance Program
STORET & WebSIM Support
Water Quality Standards
Water Quality Monitoring
Point Source-Discharge Permits
Nonpoint Source
Source Water Protection
Water Pollution Control
Total Maximum Daily Loads (TMDL)