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• Nebraska Assessment Data for 2006

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Site-specific Targeted Monitoring Summary Results

Nebraska (2006)

Description of this table

	Size of Water
	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)
Good Waters	3,437.4	45,320.8
Previously impaired waters       now attaining all uses
Threatened Waters
TMDL completed
TMDL alternative
Non-pollutant impairment
TMDL needed
Impaired Waters	3,882.3	90,222.0
TMDL completed	913.4	806.0
TMDL alternative	332.4	3,274.0
Non-pollutant impairment	259.6	2,491.0
TMDL needed	2,376.9	83,651.0
Total Assessed Waters	7,319.7	135,542.8
Total Waters	81,573.0	280,000.0
Percent of Waters Assessed	9.0	48.4

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Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2006

Site-specific Targeted Monitoring Results

Nebraska Rivers and Streams 2006

Description of this table Assessed Status Miles Assessed 7,319.7 Unassessed 74,253.3 Total Miles 81,573.0

Description of this table Attainment Status Miles Good 3,437.4 Threatened .0 Impaired 3,882.3 Total Miles Assessed 7,319.7

Description of this table TMDL Development Status Miles All TMDLs completed 913.4 TMDL alternative 332.4 Non-pollutant impairment 259.6 TMDL needed 2,376.9 Total Threatened and Impaired 3,882.3

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Nebraska Rivers and Streams 2006

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table

Designated Use	Miles Assessed	Percent Good	Percent Threatened	Percent Impaired	% Good
					% Threatened
					% Impaired
Agricultural Water Supply-Class A	4,690.9	96.1	.0	3.9
Agricultural Water Supply-Class B	65.3	100.0	.0	.0
Cold Water Aquatic Life (Class A)	188.1	64.2	.0	35.8
Cold Water Aquatic Life (Class B)	1,397.1	61.9	.0	38.1
Fish Consumption	1,334.7	45.1	.0	54.9
Primary Contact Recreation	2,891.2	38.3	.0	61.7
Public Drinking Water Supply	329.8	100.0	.0	.0
Warm Water Aquatic Life (Class A)	3,705.5	59.7	.0	40.3
Warm Water Aquatic Life (Class B)	2,091.9	55.2	.0	44.8

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Site-specific Targeted Monitoring Results

Causes of Impairment
Nebraska Rivers and Streams 2006

Description of this table

Cause of Impairment	Cause of Impairment Group	Miles Threatened or Impaired
Escherichia Coli (E. Coli)	Pathogens	1,777.0
Cause Unknown	Cause Unknown	686.7
Selenium	Metals (other than Mercury)	653.2
Polychlorinated Biphenyls (PCBs)	Polychlorinated Biphenyls (PCBs)	548.0
Dissolved Oxygen	Organic Enrichment/Oxygen Depletion	487.8
Atrazine	Pesticides	479.0
Dieldrin	Pesticides	475.9
Temperature, Water	Temperature	426.1
Ammonia, Un-ionized	Ammonia	152.3
Mercury	Mercury	144.1
pH	pH/Acidity/Caustic Conditions	87.5
Fecal Coliform	Pathogens	78.3
Iron	Metals (other than Mercury)	64.8
Copper	Metals (other than Mercury)	25.1
Chlorine, Residual (Chlorine Demand)	Chlorine	6.1
Carbon Tetrachloride	Toxic Organics	5.5
Total Dissolved Solids (TDS)	Salinity/Total Dissolved Solids/Chlorides/Sulfates	5.1
Specific Conductivity	Salinity/Total Dissolved Solids/Chlorides/Sulfates	2.0

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Site-specific Targeted Monitoring Results

Probable Sources
Nebraska Rivers and Streams 2006

Description of this table

Probable Source	Probable Source Group	Miles Threatened or Impaired
Source Unknown	Unknown	2,226.3
Non-Point Source	Unspecified Nonpoint Source	1,911.1
Natural Sources	Natural/Wildlife	1,861.6
Crop Production (Crop Land Or Dry Land)	Agriculture	370.5
Agriculture	Agriculture	347.9
Animal Feeding Operations (Nps)	Agriculture	293.5
Municipal Point Source Discharges	Municipal Discharges/Sewage	270.9
Municipal (Urbanized High Density Area)	Urban-Related Runoff/Stormwater	50.7
Wildlife Other Than Waterfowl	Natural/Wildlife	41.0
Industrial Point Source Discharge	Industrial	6.1

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Site-specific Targeted Monitoring Results

Nebraska Lakes, Reservoirs, and Ponds 2006

Description of this table Assessed Status Acres Assessed 135,542.8 Unassessed 144,457.2 Total Acres 280,000.0

Description of this table Attainment Status Acres Good 45,320.8 Threatened .0 Impaired 90,222.0 Total Acres Assessed 135,542.8

Description of this table TMDL Development Status Acres All TMDLs completed 806.0 TMDL alternative 3,274.0 Non-pollutant impairment 2,491.0 TMDL needed 83,651.0 Total Threatened and Impaired 90,222.0

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Nebraska Lakes, Reservoirs, and Ponds 2006

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table

Designated Use	Acres Assessed	Percent Good	Percent Threatened	Percent Impaired	% Good
					% Threatened
					% Impaired
Aesthetics	121,827.1	35.4	.0	64.6
Agricultural Water Supply-Class A	123,314.1	99.3	.0	.7
Cold Water Aquatic Life (Class B)	35,803.0	.2	.0	99.8
Fish Consumption	118,560.0	90.8	.0	9.2
Industrial Water Supply	30,000.0	100.0	.0	.0
Primary Contact Recreation	118,139.7	96.5	.0	3.5
Public Drinking Water Supply	30,000.0	100.0	.0	.0
Warm Water Aquatic Life (Class A)	98,914.0	46.0	.0	54.0

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Site-specific Targeted Monitoring Results

Causes of Impairment
Nebraska Lakes, Reservoirs, and Ponds 2006

Description of this table

Cause of Impairment	Cause of Impairment Group	Acres Threatened or Impaired
Phosphorus, Total	Nutrients	73,734.7
Nitrogen, Total	Nutrients	71,239.0
Nutrient/Eutrophication Biological Indicators	Nutrients	39,308.7
Dissolved Oxygen	Organic Enrichment/Oxygen Depletion	37,688.0
pH	pH/Acidity/Caustic Conditions	7,816.0
Mercury	Mercury	7,582.0
Polychlorinated Biphenyls (PCBs)	Polychlorinated Biphenyls (PCBs)	3,365.0
Cyanobacteria Hepatotoxic Microcystins	Biotoxins	3,290.3
Sedimentation/Siltation	Sediment	1,942.0
Arsenic	Metals (other than Mercury)	1,230.0
Selenium	Metals (other than Mercury)	1,216.0
Escherichia Coli (E. Coli)	Pathogens	795.0
Specific Conductivity	Salinity/Total Dissolved Solids/Chlorides/Sulfates	649.0
Fecal Coliform	Pathogens	300.0
Ammonia, Un-ionized	Ammonia	235.0
Atrazine	Pesticides	55.0
Salinity	Salinity/Total Dissolved Solids/Chlorides/Sulfates	47.0

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Site-specific Targeted Monitoring Results

Probable Sources
Nebraska Lakes, Reservoirs, and Ponds 2006

Description of this table

Probable Source	Probable Source Group	Acres Threatened or Impaired
Non-Point Source	Unspecified Nonpoint Source	81,214.0
Source Unknown	Unknown	54,539.0
Natural Sources	Natural/Wildlife	7,504.3
Agriculture	Agriculture	1,936.0
Municipal (Urbanized High Density Area)	Urban-Related Runoff/Stormwater	678.0
Highways, Roads, Bridges, Infrasturcture (New Construction)	Construction	648.0

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Nebraska Causes of Impairment for Reporting Year 2006

Description of this table

NOTE: Click on the underlined Cause of Impairment Group to see a list of specific state causes of impairment making up the Cause of Impairment Group. See also Pollution categories summary document (PDF) (20 pp, 557K, About PDF) for brief, non-technical descriptions of general cause categories.
Cause of Impairment Group	Size of Assessed Waters with Listed Causes of Impairment
	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)
Ammonia	152.3	235.0
Biotoxins		3,290.3
Cause Unknown	686.7
Chlorine	6.1
Mercury	144.1	7,582.0
Metals (other than Mercury)	718.0	2,446.0
Nutrients		81,676.7
Organic Enrichment/Oxygen Depletion	487.8	37,688.0
Pathogens	1,784.9	1,095.0
Pesticides	954.9	55.0
pH/Acidity/Caustic Conditions	87.5	7,816.0
Polychlorinated Biphenyls (PCBs)	548.0	3,365.0
Salinity/Total Dissolved Solids/Chlorides/Sulfates	7.1	696.0
Sediment		1,942.0
Temperature	426.1
Toxic Organics	5.5

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Nebraska Probable Sources Contributing to Impairments
for Reporting Year 2006

Description of this table

NOTE: Click on the underlined Probable Source Group to see a list of specific state Probable Sources making up the Probable Source Group.
Probable Source Group	Size of Assessed Waters with Probable Sources of Impairments
	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)
Agriculture	970.9	1,936.0
Construction		648.0
Industrial	6.1
Municipal Discharges/Sewage	270.9
Natural/Wildlife	1,861.6	7,504.3
Unknown	2,226.3	54,539.0
Unspecified Nonpoint Source	1,911.1	81,214.0
Urban-Related Runoff/Stormwater	50.7	678.0

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Nebraska TMDL Alternatives by Cause of Impairment 2006

Description of this table

NOTE: Click on the underlined "Number of TMDL Alternatives by Cause of Impairment " value to see a listing of those Causes of Impairment.
Cause of Impairment	Number of TMDL Alternatives	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)
Polychlorinated Biphenyls (PCBs)	16	482	3,065
Dieldrin	10	435
Ammonia, Un-ionized	3	110
Nutrient/Eutrophication Biological Indicators	2		114
Carbon Tetrachloride	1	6
Chlorine, Residual (Chlorine Demand)	1	6
Escherichia Coli (E. Coli)	1		95
Nitrogen, Total	1		35

Total: 35 TMDL Alternatives

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