Zackuse Creek Fish Passage Project Road Closure Options City - - PowerPoint PPT Presentation

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Zackuse Creek Fish Passage Project Road Closure Options City - - PowerPoint PPT Presentation

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Zackuse Creek Fish Passage Project Road Closure Options City Council Meeting July 18, 2017 Public Works Department: Tawni Dalziel, PE Senior Stormwater Program Manager Cheryl Paston, PE Deputy Public Works Director 2 Project Overview and

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City Council Meeting July 18, 2017

Zackuse Creek Fish Passage Project

Road Closure Options

Public Works Department: Tawni Dalziel, PE Senior Stormwater Program Manager Cheryl Paston, PE Deputy Public Works Director

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Project Overview and Status

  • Replace existing culvert on ELSP with fish

passable box culvert

  • Restore and realign degraded stream

channel upstream of ELSP

  • 30% design completed
  • Permits have been submitted
  • Construction start June 2018

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Decision needed tonight

Obtain direction on project road closures:

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Option 1. Full road closure Option 2. Partial road closure

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Traffic Control Options

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Full road closure Partial road closure

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Considerations

  • Stream and habitat impacts
  • Duration for culvert construction
  • Traffic impacts
  • Detour route options
  • Cost difference

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Stream Impacts

Full Road Closure

  • Reduced physical impact to sensitive areas
  • Reduced duration of impact
  • Increased time for stream to stabilize

Partial Road Closure

  • Increased physical impact to sensitive areas
  • Additional mitigation required
  • Increase duration of impact
  • Reduced time for stream to stabilize

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Duration for Culvert Construction

Full Road Closure = 7 days

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Partial Road Closure = 6 weeks

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Traffic Impacts Full Road Closure

  • High impact/short duration
  • Impacts commuter traffic
  • Adds time depending on detour route taken
  • Impacts residents along ELSP & detour routes
  • Greater vehicle and construction safety

Partial Road Closure

  • High impact/significantly longer duration
  • Impacts commuter traffic
  • Adds time due to construction queue delay
  • Reduced vehicle and construction safety

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Traffic Impacts

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  • 2017 average daily traffic for

ELSP road section = 8,500.

  • 6000 trips diverted to

proposed detour route.

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Detour Route Options

SE 24th Way ex ADT 1270 Snake Hill ex ADT 4790 SE 43rd Way ex ADT 17270

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1 2 3 X 1 2 3

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Cost Comparison

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*All costs provided are at 30% estimate level

Project Financial Summary Option 1: Full Road Closure Estimate Option 2: Partial Road Closure Estimate Design $381,189 $381,189 Construction Contract* $1,050,000 $1,340,000 Construction Inspection* $150,000 $200,000 Management Reserve* $105,000 $134,000 Expense Sub-total $1,686,189 $2,055,189 Grants $821,906 $821,906

Total cost to City after grant use $864,283 $1,233,283

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Additional Considerations

Ways to shorten time of road closures:

─ Provide monetary incentives to contractor for finishing early ─ Allow night-time work, weekend work or extended hours 12

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Recommendation

It is recommended that a full road closure be approved.

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