Point Hollow Creek (aka White Pine Cr.) IA 01-TRK-165

mouth (S31 T91N R2W Clayton Co.) to spring source in S8 T90N R2W Dubuque Co.

Assessment Cycle

2022

Release Status

Final

Data Collection Period

For purposes of developing stream/river water quality assessments for integrated reporting, three years of water quality data are typically used for both conventional pollutant parameters (e.g., indicator bacteria) and the less frequently monitored toxic parameters (e.g., toxic metals). Since the 2004 IR cycle, DNR has used a three-year data gathering period for streams, rivers, and beaches. For most assessments, the use of three years of data increases the number of samples upon which the decision on use support is based and helps address the problem of weather-related year-to-year fluctuations in water quality.

Due to the lower sampling frequency in Iowa’s ambient lake, biological, fish kill, and fish tissue monitoring programs, five years of data are used for developing IR assessments and for identifying Section 303(d) listings.

Data Type	Data Timeframe
Beach Sampling Data	CY 2018 - 2020
Stream/River Water Quality Data	CY 2018 - 2020
Lake Water Quality Data	CY 2016 - 2020
Biological Sampling Data	CY 2016 - 2020*
Fish Kill Data	CY 2016 - 2020
Fish Tissue Sampling Data	CY 2016 - 2020
Continuous Dissolved Oxygen Sampling Data	CY 2016 - 2020
*Biological sites sampled in both 2015 and 2019 were also assessed.

Overall IR Category: 5 - Water is impaired or threatened and a TMDL is needed.
Trend: Unknown

Created: 12/21/2021 5:31:28 AM
Updated: 1/25/2022 8:54:29 AM

Assessment conducted in accordance with Iowa's 2022 IR methodology

Use Support

Class A1

Recreation

Primary contact

Presumptive Use

Not Supported

Impairments

Support Level

Not Supported

Impairment Code

5p - Impairment occurs on a waterbody with a presumptive A1 or B(WW1) use.

Cause Magnitude

Moderate

Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

N/A

Cycle Added

2014

Impairment Rationale

Geometric mean criterion exceeded

Data Source

Watershed project monitoring

TMDL Priority

Tier III

Class A2

Recreation

Secondary contact

Not Supported

Impairments

Support Level

Not Supported

Impairment Code

5p - Impairment occurs on a waterbody with a presumptive A1 or B(WW1) use.

Cause Magnitude

Slight

Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

N/A

Cycle Added

2016

Impairment Rationale

Geometric mean criterion exceeded

Data Source

Watershed project monitoring

TMDL Priority

Tier III

Class BCW1

Aquatic Life

Cold Water Type 1

Not Supported

Impairments

Support Level

Not Supported

Impairment Code

5b-v - Biological - verified

Cause Magnitude

Moderate

Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

Low

Cycle Added

2006

Impairment Rationale

Low Biotic Index

Data Source

Biological monitoring: Iowa DNR WQMA

TMDL Priority

Tier IV

Support Level

Not Supported

Impairment Code

4d - Pollutant-caused fish kill. No TMDL needed and administrative action taken against responsible party.

Cause Magnitude

Moderate

Status

Continuing

Source

Agriculture: Feedlots

Source Confidence

Moderate

Cycle Added

2020

Impairment Rationale

Pollutant-caused fish kill

Data Source

Fish kill investigation: Iowa DNR

Further Investigation Needed

Support Level

Water in Need of Further Investigation (WINOFI)

Impairment Code

3b - Use potentially impaired based on an evaluated assessment.

Cause Magnitude

Moderate

Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

Low

Cycle Added

2016

Impairment Rationale

Significantly > 10% of samples fail to meet criterion

Data Source

Ambient monitoring: Iowa DNR-continuous

Class HH

Human Health

Not Assessed

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

Both the presumptive Class A1 and the Class A2 uses remain assessed as “not supported” due to levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class BCW1 use was assessed as "not supported" based on a fish kill investigation, biological sampling data and "fully supported" based on continuous dissolved oxygen monitoring data. All other designated uses were "not assessed."

Assessment Explanation

Data Sources:

Data Source	Data Source ID	Data Type	Data Age	Site ID	Site Name	Site Description
Iowa DNR	6	WQ	CY 2010, 2012	11310005	White Point Hollow near Luxemburg	Site WPH1
Iowa DNR	6	WQ	CY 2010, 2012	11310006	White Point Hollow near Luxemburg
Iowa DNR	6	BIO	See Below	407	White Point Hollow Creek	Luxemburg
Iowa DNR	6	BIO	See Below	370	White Point Hollow Creek	Luxemburg – REMAP #58

Presumptive Class A1 - Indicator Bacteria: 2010

Site ID	Data Source ID	# Samples / # Years	2010 Geomean	Annual Geomean Violation	# Violations	% Violations	Significantly >10% Violations	Assessment Type	Support Level
11310005	6	16 / 1	917	Yes	12	75%	Yes	Evaluated	Not
11310006	6	9 / 1	359	Yes	6	67%	Yes	Evaluated	Not

Class A2 - Indicator Bacteria:

Site ID	Data Source ID	# Samples / # Years	2010 Geomean	Annual Geometric Mean Violation	# Violations	% Violations	Significantly >10% Violations	Assessment Type	Support Level
11310005	6	17 / 1	991	Yes	6	35%	Yes	Evaluated	Not
11310006	6	10 / 1	461	No	2	20%	No	Evaluated	Full

Class BCW1 - Biological Sampling:

Benthic Macroinvertebrates:

Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage	BM Sample Gear	CBI score	CBI Class	CBI BIT	CBI Pass/Fail
370	8/23/19	3.9	52b	MS	Surber	41	NA	60	Pass
407	7/22/15	6.1	52b	MS	Surber	51	NA	60	Pass

Overall:

Community	Assessment Type	Assessment Result	Support Level	IR Category	Reason
Benthic Macroinvertebrates	Monitored	Fail (0/2)	Not		Assessment was monitored because the assessment used multiple
Overall	Monitored	Fail	Not	5bv	samples collected in a recent five year period to complete the assessment.

Class BCW1- Fishkill Assessment:

The Class BCW1 use assessment based on the 2017 fish kill placed this segment in Category 4d. The fish kill was caused by a “pollutant” or was suspected to be caused by a “pollutant”; therefore, the Class BCW1 use was considered impaired. However, because restitution for the fish killed was received, the Class BCW1 use was placed in Category 4d (impaired but TMDL not required). DNR feels that (1) TMDLs should not be required for a fish kill caused by a one-time illegal or unauthorized release of a pollutant where enforcement action was taken and (2) enforcement action is more appropriate and effective for addressing a spill-related impairment than the TMDL process.

Details about the 2017 fish kill can be found here: https://programs.iowadnr.gov/fishkill/Events/948

Class BCW1 - Continuous DO Monitoring:

Site ID	Data Source ID	# Days Monitoring (2016/2017/2018/ 2019/2020)	DO Criteria Type	# 2016 violations / Violations needed for impairment	# 2017 violations / Violations needed for impairment	# 2018 violations / Violations needed for impairment	# 2019 violations / Violations needed for impairment	# 2020 violations / Violations needed for impairment	Violates Annual Significantly >10% Rule?	Assessment Type	Support Level
			24 hr	NA	NA	NA	0/6	NA	No
370	6	0/0/0/31/0	16 hr	NA	NA	NA	0/6	NA	No	Evaluated	Full

Class HH – No Data

Monitoring and Methods

Assessment Key Dates

7/22/2015

Biological Monitoring

3/10/2010

Non-fixed Monitoring Start Date

7/26/2010

Non-fixed Monitoring End Date

8/23/2019

Biological Monitoring

6/21/2012

Non-fixed Monitoring Start Date

10/9/2012

Non-fixed Monitoring End Date

7/5/2017

Fish Kill

Methods

120

Surveys of fish and game biologists/other professionals

140

Incidence of spills and/or fish kills

150

Monitoring data more than 5 years old

220

Non-fixed station physical/chemical monitoring (conventional pollutant only)

222

Non-fixed-station monitoring (conventional during key seasons and flows)

315

Regional reference site approach

320

Benthic macroinvertebrate surveys

380

Quantitative physical habitat assessment

420

Indicator bacteria monitoring