Hayward Lake Dam 2019 Inspection Report.pdf

DAM SAFETY INSPECTION REPORT

HAYWARD LAKE DAM – DAM ID NO. 217

WALTON RIVER

MENOMINEE COUNTY – SECTION 18, T35N, R25W

OWNER/OPERATOR: Michigan Department of Natural Resources Crystal Falls Field Office, Wildlife Division

1420 Highway US-2 West Crystal Falls, MI 49920 906-875-6622

HAZARD POTENTIAL

CLASSIFICATION: Low

INSPECTION DATE: June 25, 2019

REPORT DATE: November 20, 2019

INSPECTED AND PREPARED BY:

Lucas A. Trumble, P.E.

Hydrologic Studies and Dam Safety Unit Water Resources Division Department of Environment, Great Lakes, and Energy P.O. Box 30458 Lansing, Michigan 48909 517-420-8923

INTRODUCTION

The purpose of this inspection was to evaluate the structural condition and hydraulic capacity of the Hayward Lake Dam, as required by Part 315, Dam Safety (Part 315), of the Natural Resources and Environmental Protection Act, 1994 PA 451, as amended.

This inspection was conducted by the Department of Environment, Great Lakes, and Energy (EGLE) per the provisions of its Memorandum of Understanding with the Department of Natural Resources (DNR), the owner of the dam. The report is limited to a discussion of observations based on a visual investigation and review of any available previous inspection reports, plans, and data. This report was not based on an in-depth engineering investigation. All references to “right” and “left” in this report are based on the observer facing downstream.

CONCLUSIONS AND RECOMMENDATIONS

The Hayward Lake Dam is in satisfactory condition overall. There were no deficiencies observed during the inspection that would lead to the dam’s failure. The dam has adequate spillway capacity to safely convey the design flood. The following recommended actions are listed by priority:

1. Remove all trees and brush from the earthen embankments by the end of 2024.

After clearing, mow both embankments a minimum of two times per year to prevent further establishment of woody vegetation and to facilitate visual inspection.

2. Repair minor spalling of the principal spillway pier noses and walls as soon as practical.

3. Periodically review the dam’s Operation and Maintenance Plan (O&M Plan) and update as necessary. Provide updated copies to the Dam Safety Program.

The current low hazard rating is appropriate.

PROJECT INFORMATION

The Hayward Lake Dam was constructed in 1952 to stabilize the level of Hayward Lake and provide a wildlife habitat. Reduced copies of the design plans are on file with the Dam Safety Program.

The Hayward Lake Dam consists of a 161-foot long earth embankment with a height of

9.5 feet, as measured from the top of the embankment to the invert of the outlet channel. The principal spillway consists of a straight drop concrete structure with five bays. The center bay has two 5.25-foot long stoplog sections. The four remaining bays each have a 10-foot long fixed crest concrete section. The total spillway length is 50 feet, 6 inches.

The height of the dam, as defined by Part 315, is the difference in elevation from the design flood elevation to the invert of the outlet stream. That height for the Hayward Lake Dam is approximately 8.5 feet. The head, or difference in upstream and downstream water elevations, was approximately five feet on the date of the inspection.

The normal freeboard is approximately four feet. The impoundment created by the dam has a surface area of approximately 1,800 acres under normal conditions.

Inspection reports from 1999, 2004, 2009, and 2014, prepared by the Dam Safety Program, were used as references for this report.

SITE INVESTIGATION

The following discussion of the dam’s physical condition and appurtenances is based on observations and photographs obtained on the inspection date.

The dam’s earthen embankments, shown in Photographs 1 through 3 and 6 through 8, are in fair condition. No slumps, slides, settlement, or erosion were observed. A gravel road, in good condition, traverses the crest of the embankment. However, there is significant overgrowth of trees and brush along the upstream and downstream slopes of both embankments. Trees and brush can provide shortened seepage pathways along their root systems that can lead to internal erosion (piping) of embankment materials, cause large section loss in the event of a blow down, provide a haven for burrowing animals, and obscure underlying deficiencies. Therefore, all trees and brush should be removed from the embankments prior to the next inspection of the dam in 2024. After clearing, both embankments should be mowed a minimum of two times per year to prevent further establishment of woody vegetation and facilitate visual inspection.

The principal spillway, shown in Photographs 9 through 18, is in satisfactory condition.

No differential settlement, misalignment, or major cracking or deterioration was observed. Several pier noses and spillway bays near the water line are spalled, as mentioned in previous inspection reports. However, this minor deterioration does not currently pose a threat to the structural integrity or stability of the spillway. Spalling and cracking will accelerate deterioration of the concrete through repeated freeze/thaw cycles. As such, consideration should be given toward repairing spalled areas when practical.

STRUCTURAL STABILITY

Based upon observations during the inspection, there were no indicators of any conditions that represent an immediate threat to the dam’s stability.

http://www.damsafety.org/media/Documents/Images-Animations/Dam%20Animations/Perf2ImperfDam.wmv http://www.damsafety.org/media/Documents/Images-Animations/Dam%20Animations/Piping.wmv

HYDROLOGY AND HYDRAULICS

The contributing drainage area to the Walton River at the Hayward Lake Dam is approximately 49.6 square miles. The design discharge for this low hazard potential dam is the 1-percent annual chance (100-year) flood discharge, which is estimated to be 800 cubic feet per second (cfs). The principal spillway can pass 860 cfs, with

1.0 feet of freeboard. Therefore, the dam is considered to have adequate spillway capacity to safely convey the design flood.

Copies of the hydraulic calculations used to make this determination are on file with the Dam Safety Program.

OPERATION AND MAINTENANCE

Operation of the dam is the responsibility of the owner or their designee. A written O&M Plan for this dam is on file with the Dam Safety Program. This plan should be reviewed periodically and updated as necessary. Updated copies should be provided to the Dam Safety Program.

EMERGENCY ACTION PLAN

Due to the low hazard potential rating for this dam, an Emergency Action Plan (EAP) is not required under Part 315. According to our records, an EAP has not been developed.

APPENDICES

A location map, inspection photographs, and the 2019 EGLE estimated flood flows for the dam are attached.

Hayward Lake Dam Dam ID No. 217 Section 18, T 35N, R 25W Menominee County

HAYWARD LAKE

DAM

HAYWARD LAKE DAM

MENOMINEE COUNTY

DAM ID NO. 217

Photograph 1 – Upstream slope of right embankment

Photograph 2 – Crest of right embankment

Photograph 3 – Downstream slope of right embankment

Photograph 4 – Impoundment viewed from dam

Photograph 5 – Downstream channel viewed from top of dam

Photograph 6 – Upstream slope of left embankment

Photograph 7 – Crest of left embankment

Photograph 8 – Downstream slope of left embankment

Photograph 9 – Upstream face of dam and bridge

Photograph 10 – Spillway weir and pier viewed from bridge deck

Photograph 11 – Spillway weir and pier viewed from bridge deck

Photograph 12 – Stoplog bay and piers viewed from bridge deck

Photograph 13 – Dam viewed from downstream

Photograph 14 – Spillway bay and pier viewed from downstream

Photograph 15 – Stoplog bay and pier viewed from downstream

Photograph 16 – Left abutment viewed from downstream

Photograph 17 – Right abutment viewed from downstream

Photograph 18 – Upstream left abutment viewed from bridge deck

Photograph 18 – Downstream left abutment viewed from bridge deck

From: deq-wrd-qreq <deq-wrd-qreq@michigan.gov> Sent: Thursday, February 14, 2019 5:39 PM To: Pawloski, Jim (DEQ) <PAWLOSKIJ@michigan.gov> Cc: Trumble, Luke (DEQ) <TrumbleL@michigan.gov> Subject: RE: flood or low flow discharge request (ContentID - 168812)

We have estimated the flood frequency discharges requested in your email of February 11, 2019 (Process No. 20190089), as follows:

Walton River at Hayward Lake Dam, Dam ID 217, Section 18, T35N, R25W, Cedarville Township, Menominee County, has a drainage area of 49.6 square miles. The design discharge for this dam is the 1% chance (100-year) flood. The 1% chance peak flow is estimated to be 800 cubic feet per second.

(Watershed Basin No. 42 Cedar).

Please include a copy of this letter with your inspection report or any subsequent application for permit.

These estimates should be confirmed by our office if an application is not submitted within one year. If you have any questions concerning the discharge estimates, please contact Ms. Susan Greiner, Hydrologic Studies and Dam Safety Unit, at 517-284-5579, or by email at: GreinerS@michigan.gov.

-----Original Message----- From: PAWLOSKIJ@michigan.gov <PAWLOSKIJ@michigan.gov> Sent: Monday, February 11, 2019 2:13 PM To: deq-wrd-qreq <deq-wrd-qreq@michigan.gov> Subject: flood or low flow discharge request (ContentID - 168812)

Requestor: Jim Pawloski Company: DEQ Address: 2100 West M-32 City: Gaylord, MI Zip: 49735 Phone: 989-370-1528 Date: 2019-02-11 F1percent: Yes ContactAgency: None Selected ContactPerson:

Watercourse: Walton River LocalName:

CountyLocation: Menominee CityorTownship: ?

Section: 18 Town: 35N Range: 25W Location: Hayward Lake Dam #217 FFR1: Dam mailto:deq-wrd-qreq@michigan.gov mailto:PAWLOSKIJ@michigan.gov mailto:TrumbleL@michigan.gov mailto:GreinerS@michigan.gov mailto:PAWLOSKIJ@michigan.gov mailto:PAWLOSKIJ@michigan.gov mailto:deq-wrd-qreq@michigan.gov