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

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 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

3 Decision needed tonight Obtain direction on project road closures: Option 1. Full road closure Option 2. Partial road closure

4 Traffic Control Options Full road closure Partial road closure

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

6 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

7 Duration for Culvert Construction Full Road Closure = 7 days Partial Road Closure = 6 weeks

8 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

9 Traffic Impacts • 2017 average daily traffic for ELSP road section = 8,500. • 6000 trips diverted to proposed detour route.

10 Detour Route Options SE 24 th Way 1 X ex ADT 1270 Snake Hill 2 1 ex ADT 4790 SE 43 rd Way 3 2 ex ADT 17270 3

11 Cost Comparison Project Option 1: Option 2: Financial Full Road Closure Partial Road Closure Summary Estimate 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 $864,283 $1,233,283 after grant use *All costs provided are at 30% estimate level

12 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

13 Recommendation It is recommended that a full road closure be approved.