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NR 328.05(5) (5)Riprap or vegetated armoring. Riprap or vegetated armoring on the bed or bank of a lake or flowage may be authorized under this general permit if it meets all of the requirements of s. NR 328.04 (3) with the exception that it may be located in an area of special natural resource interest, and with additional limitations as follows:
NR 328.05(5)(a) (a) Riprap or vegetated armoring may not exceed 200 linear feet of shoreline.
NR 328.05(5)(b) (b) The project site is a moderate or high energy site; or a low energy site where the bank-edge recession described in s. NR 328.08 (3) is equal to or greater than 0.5 feet per year and the applicant can show a biological erosion control structure was previously placed according to the standards in s. NR 328.04 (3) and (4).
NR 328.05 Note Note: NR 328.08 (3) requires that the time between separate measurements shall equal or exceed 3 months during the open-water season.
NR 328.05 Note Note: The applicant will satisfy the “equal to or greater than 0.5 feet per year" requirement by demonstrating that the bank-edge recession is equal to or greater than 1.5 inches per 3 months during the open-water season.
NR 328.05(5)(c) (c) Riprap shall be clean fieldstone or quarry stone 6 to 24 inches in diameter.
NR 328.05(5)(d) (d) The toe of the riprap may not extend more than 8 feet waterward of the ordinary high water mark.
NR 328.05(5)(e) (e) The final riprap slope may not exceed (be steeper than) 2 feet horizontal to one foot vertical.
NR 328.05(5)(f) (f) Riprap may not be placed at an elevation higher than the ordinary high water mark plus the storm-wave height as calculated in s. NR 328.08 (1). For waters subject to subch. II, riprap may not be placed at an elevation higher than the ordinary high water mark plus 1.5 times the storm-wave height calculated in s. NR 328.08.
NR 328.05 Note Note: The listed waters in subch. II are typified by following conditions – impounded; 2500 acres and larger; extensive water level fluctuation; high shoreline recession rates; historic loss of shoreline vegetation.
NR 328.05(5)(g) (g) No fill material or soil may be placed in a wetland or below the ordinary high water mark of any navigable waterway.
NR 328.05(5)(h) (h) The riprap shall follow the natural contour of the shoreline.
NR 328.05(5)(i) (i) Filter cloth or clean-washed gravel shall be used as a filter layer under the riprap to extend the life of the structure, improve effectiveness and prevent soil erosion behind the riprap.
NR 328.05(5)(j) (j) Riprap or other vegetated armoring along moderate energy sites shall be re-vegetated above the ordinary high water mark by using native shrub plantings, native live stakes or native jointed plantings.
NR 328.05 Note Note: Erosion control treatments may include a 10-foot shoreline segment where plant establishment is not required for the purpose of ingress/egress associated with the placement of a pier or access to the waterway, or associated with public park activities.
NR 328.05(6) (6)Replacement of an existing seawall with riprap or vegetated armoring. Replacement of an existing seawall with riprap or vegetated armoring on the bed or bank of a lake or flowage may be authorized under this general permit if it meets all of the requirements of sub. (5) (c) to (j) and s. NR 328.04 (3) with the exception that it may be located in an area of special natural resource interest, and may not exceed 500 linear feet.
NR 328.05(7) (7)Seawall replacement. Replacement of an existing seawall on the bed or bank of a navigable water adjacent to a riparian property may be authorized under this general permit if it meets all of the requirements and limitations:
NR 328.05(7)(a) (a) The replacement may not exceed 100 feet of shoreline located on an inland lake or flowage of 300 acres or more.
NR 328.05(7)(b) (b) Seawall replacement may be permitted only at the following locations:
NR 328.05(7)(b)1. 1. Municipal or commercial marinas where vertical docking facilities are a practical alternative after considering the public interest.
NR 328.05(7)(b)2. 2. Navigational channels actively used as thoroughfares or for access, where slopes are greater (steeper) than 1.5 feet vertical to one foot horizontal, showing evidence of erosion, where alternative methods of erosion control would impede navigation.
NR 328.05(7)(b)3. 3. Locations where slopes are greater (steeper) than 1.5 feet vertical to one foot horizontal, and where the applicant demonstrates that alternative measures are not practicable taking into consideration bank height and the location of other permanent structures on the property.
NR 328.05(7)(c) (c) The seawall replacement shall incorporate an adequate footing to prevent settlement, tipping or undermining.
NR 328.05(7)(d) (d) The seawall shall be attached, where appropriate, to tieback anchors placed on the upland to prevent or minimize tipping of the wall.
NR 328.05(7)(e) (e) The seawall shall include weep holes where necessary to relieve hydrostatic pressure in upland soils. A filter fabric or gravel filter layer backing at weep holes shall be installed to facilitate drainage and prevent the loss of soil from behind the wall.
NR 328.05(7)(f) (f) For locations identified in par. (b) 3., rock riprap shall be placed in front of the seawall to dissipate wave energy, minimize scour at the base of the wall and provide aquatic habitat. Rock shall be placed to the top of the wall. Riprap shall be clean fieldstone or quarry stone 6 to 24 inches in diameter, placed at a slope not to exceed (be steeper than) 2 feet horizontal to one foot vertical, and may not extend more than 8 feet waterward of the face of the seawall.
NR 328.05(7)(g) (g) Each end of the seawall shall be buried or keyed into the bank to prevent flanking.
NR 328.05(7)(h) (h) The seawall may be built only high enough to prevent the over-topping by storm waves.
NR 328.05(7)(i) (i) To stop the spread of invasive species and viruses from one navigable waterway to another navigable waterway, all equipment or portions of equipment used for constructing, operating, or maintaining the project, including tracked vehicles, barges, boats, silt or turbidity curtains, hoses, sheet piles, and pumps, shall be decontaminated for invasive species and viruses before and after use or prior to use within another navigable waterway. Decontamination activities shall be performed by taking actions specified in subd. 1. to 3. or 8. Decontamination shall include either subd. 4., 5., 6., 7., or 8. for any equipment, or portions of equipment, that is used in non-frozen navigable waters when the air temperature is above 19 degrees Fahrenheit at the time the decontamination procedures take place.
NR 328.05(7)(i)1. 1. Inspect all equipment used for constructing, operating, or maintaining the project and remove all plants and animals, and other mud, debris, etc.
NR 328.05(7)(i)2. 2. Drain all water from equipment used in navigable waters.
NR 328.05 Note Note: This does not apply to water in closed engine cooling systems or water tanks, or containers of potable drinking water or other beverages meant for human consumption. If a tanker truck discharges water collected from navigable waters in upland areas, the tank does not require disinfection.
NR 328.05(7)(i)3. 3. Dispose of plants and animals in the trash. An operator may not transfer plants or animals or water from one navigable waterway to another.
NR 328.05(7)(i)4. 4. Wash equipment at a temperature of not less than 212 degrees Fahrenheit water (steam clean).
NR 328.05(7)(i)5. 5. Wash equipment with soap and water or high pressure water of not less than 2000 pounds per square inch.
NR 328.05(7)(i)6. 6. Allow equipment to dry thoroughly for not less than 5 days.
NR 328.05 Note Note: Additional drying techniques including drying through natural or mechanical means or changes in drying duration may be submitted to the department for review and approval.
NR 328.05(7)(i)7. 7. Disinfect equipment with 200 parts per million (0.5 ounces per gallon) chlorine for not less than 10 minute contact time. Every effort should be made to keep the disinfection solution and rinse water out of surface waters.
NR 328.05 Note Note: Chlorine refers to either household bleach solution (5.25% chlorine) or granular chlorine (70% calcium hypochlorite).
NR 328.05(7)(i)8. 8. Follow the most recent department approved disinfection protocols or department approved best management practices for infested waters. The department shall maintain on its website and make available at its offices a list of the most recent disinfection protocols or department approved best management practices for invasive species and viruses.
NR 328.05 Note Note: See the department's website at http://dnr.wi.gov under the topic “Waterway and Wetlands". Recommendations for additional disinfection or decontamination protocols or department approved best management practices may be submitted to the department for review and approval to be added to this list.
NR 328.05(8) (8)Individual permit required.
NR 328.05(8)(a)(a) Activities which do not meet the applicable standards in sub. (3), (4), (5), (6) or (7) are otherwise ineligible for a general permit shall require an individual permit.
NR 328.05(8)(b) (b) The department has authority under s. 30.206 (3r), Stats., to require an individual permit in lieu of a general permit.
NR 328.05 History History: CR 02-099: cr. Register April 2005 No. 592, eff. 5-1-05; CR 07-094: cr. (7) (i) Register November 2008 No. 635, eff. 12-1-08; CR 09-123: am. (6) Register July 2010 No. 655, eff. 8-1-10; correction in (2) made under s. 13.93 (4) (b) 7., Stats., Register May 2013 No. 689.
NR 328.06 NR 328.06Individual permits.
NR 328.06(1) (1)Procedures.
NR 328.06(1)(a)(a) Individual permits shall be processed according to the procedures in ch. NR 310.
NR 328.06(1)(b) (b) If the department determines that a proposal submitted under this section has the potential to impact an endangered or threatened species in accordance with s. 29.604, Stats., the application shall be deemed incomplete. The department may not consider the application complete or issue a general permit until the applicant submits documentation to demonstrate one of the following:
NR 328.06(1)(b)1. 1. The project avoids impacts to the endangered or threatened species in accordance with s. 29.604, Stats.
NR 328.06(1)(b)2. 2. The project has received an incidental take authorization under s. 29.604, Stats.
NR 328.06(1)(c) (c) If the applicant modifies the project plans to meet the requirements of par. (b), the modified plans shall be submitted before the department may consider the application complete or issue a general permit.
NR 328.06(2) (2)Applicable activities. Any shore erosion control structure which is not exempt under s. NR 328.04, is not authorized by a general permit under s. NR 328.05, requires authorization by an individual permit pursuant to s. 30.12 (1), Stats.
NR 328.06(3) (3)Riprap.
NR 328.06(3)(a)(a) Moderate or high energy site. Construction of new riprap at moderate or high energy sites which do not meet the general permit standards in s. NR 328.05 may be authorized by an individual permit provided that the construction meets the standards in s. 30.12 (3m), Stats., and the rules promulgated thereunder.
NR 328.06(3)(b) (b) Low energy site. Construction of new riprap at low energy sites may be authorized by an individual permit provided one of the following can be shown:
NR 328.06(3)(b)1. 1. The bank-edge recession described in s. NR 328.08 (3) is equal to or greater than 0.5 feet per year, and the construction meets the standards in s. 30.12 (3m), Stats., and sub. (5).
NR 328.06(3)(b)2. 2. The EI score described in s. NR 328.08 (2) is equal to or greater than 40, and the construction meets the standards in s. 30.12 (3m), Stats., and sub. (5).
NR 328.06(4) (4)Seawalls. Seawalls meeting the standards in s. 30.12 (3m), Stats., may be authorized under an individual permit, except that seawalls at low energy sites may only be permitted in the following locations:
NR 328.06(4)(a) (a) Municipal or commercial marinas where vertical docking facilities are a practical alternative after considering the public interest.
NR 328.06(4)(b) (b) Navigational channels actively used as thoroughfares or for access, where slopes are greater (steeper) than 1.5 feet vertical to one foot horizontal, showing evidence of erosion, where alternative methods of erosion control would impede navigation.
NR 328.06(4)(c) (c) Locations where slopes are greater (steeper) than 1.5 feet vertical to one foot horizontal, and where the applicant demonstrates that alternative measures are not practicable taking into consideration bank height and the location of other permanent structures on the property.
NR 328.06(5) (5)Analysis of individual permits. The department shall consider factual data from applicants regarding all of the following factors in evaluating individual permit applications:
NR 328.06 Note Note: The Department's analysis of individual permits is not constrained to the general permit standards identified in s. NR 328.05.
NR 328.06(5)(a) (a) Whether shore protection measures allowed without permits or with a general permit would provide adequate erosion control.
NR 328.06(5)(b) (b) The cumulative and individual impact on public rights and interests including fish and wildlife habitat, physical, chemical and biological effects on the adjacent waterway and natural scenic beauty including: interference with navigation and its incidents, i.e, swimming, boating, fishing and hunting; impacts on natural scenic beauty; and impacts on special concern, threatened or endangered species.
NR 328.06 Note Note: Less developed areas of the lake or less developed lakes in general will experience greater impacts on natural scenic beauty from the structure and its activity than other more developed areas or lakes.
NR 328.06 Note Note: Survey information indicates that special concern, threatened, or endangered species or their habitats are found near the site.
NR 328.06(5)(c) (c) Impacts on littoral zone and nearshore habitat including: reduced density of woody cover in shallow water; reduced density, coverage and diversity of nearshore vegetation, such as terrestrial, emergent, floating-leafed and submerged zones; designated sensitive areas, spawning or nursery habitat.; change in nearshore substrate that reduces its suitability for habitat.
NR 328.06 Note Note: The structure and its associated activity located in or near spawning/nursery habitats or designated sensitive areas.
NR 328.06(5)(d) (d) The erosion exposure of the project site based on site-specific conditions, including ice and the presence of natural ice ridges.
NR 328.06(5)(e) (e) The effect of the project on the adjoining upland and its ability to prevent erosion and sedimentation into the waterway.
NR 328.06(5)(f) (f) Whether project designs or specific conditions can avoid or reduce impacts of the structure. Designs shall have high likelihood of success, and duration equal to the life-span of the structure.
NR 328.06(6) (6)Existing permits. A shore protection structure which is authorized by an existing department permit shall continue to be authorized, provided the structure is maintained in compliance with all the conditions of the original permit. Any modifications to the structure that do not comply with the original permit conditions shall require a new individual permit and shall comply with all standards in this section.
NR 328.06 History History: CR 02-099: cr. Register April 2005 No. 592, eff. 5-1-05.
NR 328.07 NR 328.07Prohibited erosion control methods.
NR 328.07(1)(1)Permanent breakwaters. Except as provided in subch. II, construction of permanent breakwaters is prohibited.
NR 328.07(2) (2)New seawalls. Except as provided in s. NR 328.06 (4) or s. 30.203, Stats., construction of new seawalls is prohibited.
NR 328.07(3) (3)New riprap. Construction of new riprap is prohibited at low energy sites, except as provided in s. NR 328.06 (3) (b).
NR 328.07 Note Note: Construction of new riprap may be authorized at moderate and high energy sites as provided in s. NR 328.05 (5) or 328.06 (3).
NR 328.07 History History: CR 02-099: cr. Register April 2005 No. 592, eff. 5-1-05.
NR 328.08 NR 328.08Data requirements and site assessment methods. Applicants and department staff shall adhere to the following data requirements and site assessment methods:
NR 328.08(1) (1)Calculation of storm-wave height. The department shall provide applicants with worksheets and internet-based computer software for the purpose of estimating storm wave height. Computer software shall be mathematically designed based on Young and Verhagen (1996) and Young (1998). Storm-wave heights shall be estimated according to Young and Verhagen (1996) and Young (1997) by applying a storm wind speed of 35 miles per hour (51.45 ft/sec), fetch at the applicant's shore protection site, and the average depth along that fetch. To record fetch, applicants shall measure the longest unobstructed straight-line distance originating from the shore protection site across the water surface to the opposite intersect with the shore. To estimate average depth applicants shall examine a lake map, sum the reported depths along the fetch, and divide by the number of recorded values. At least 5 equally placed intervals along the fetch shall be used.
NR 328.08 Note Note: The citation for Young (1997) is as follows: Young, I.R. 1997. The growth rate of finite depth wind-generated waves. Coastal Engineering, Vol. 32, pp. 181-195. The citation for Young and Verhagen (1996) is as follows: Young, I.R. and L.A. Verhagen. 1996. The growth of fetch limited waves in finite water depth. Coastal Engineering, Vol. 29, pp. 47-78.
NR 328.08 Note Note: Statewide storm wind speeds are estimated from Naber Knox, P. 1996. Wind Atlas of Wisconsin. Wisconsin Geological and Natural History Survey, Bulletin No. 94.
NR 328.08(2) (2)Calculation of erosion intensity. Where an applicant or the department believes that, as a result of site conditions, storm-wave height as calculated in sub. (1) may inaccurately predict the degree of erosion, the erosion intensity score may be calculated to determine erosion. The department shall provide applicants with worksheets and internet-based computer software for the purpose of calculating erosion intensity. When the department or applicants assess erosion at the shore protection site, they shall apply methods outlined in Table 1 to calculate an erosion intensity score. Wherever EI and storm-wave height result in different energy categories, the site shall be placed in the category as determined by EI.
NR 328.08(3) (3)Bank edge recession measurements. Methods of measuring bank edge recession shall include all of the following: establishment of a physical measurement reference line between at least 2 headstakes; date-imbedded photographs showing the initial installation of the reference line and headstakes; reference distance measures to the bank lip shall be reported on department supplied forms; and time between separate measurements shall equal or exceed 3 months during the open-water season.
Table 1
Erosion Intensity (Ei) Score Worksheet

Applicants and department staff shall use this worksheet to calculate erosion intensity pursuant to s. NR 328.08 (2). - See PDF for table PDF
Note: Table 1 is adapted from Knutson, P. L., H. H. Allen, and J. W. Webb, 1990. “Guidelines for Vegetative Erosion Control on Wave-Impacted Coastal Dredged Material Sites, “Dredging Operations Technical Support Program Technical Report D-90-13,U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS 39180, 35 pp.
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Published under s. 35.93, Stats. Updated on the first day of each month. Entire code is always current. The Register date on each page is the date the chapter was last published.