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5 Route Alternatives for the Mirada/ Miramar Road Bridge Fix ~ Public Comment Period Ends Jan. 15th, 2021
December 31, 2020 - January 15, 2021
Public Comment period is 12/16/20 – 1/15/21
Alex Zhang firstname.lastname@example.org 650-363-4100
Wency Ng email@example.com 650-363-4100
San Mateo County Public Works, Jim Porter, Presents to MCC Dec. 9th, 2020
Along Mirada Road in Miramar, inevitable deterioration of rock slope protection (riprap) from wave action is ongoing.
2016: Coastal Commission granted two emergency permits, G-2-16-0018 for supplemental riprap boulders at toe of bank approximately 100 feet south of Medio Ave, and G-2-16-0066 for roadway shoulder revetment repairs between Magellan and Medio: County project page.
2016 July: County Sea Level Rise Adaptation Design Charrette with breakout discussion on Mirada Rd, and follow-up MCC meeting (minutes, Item 4b) where Supervisor Horsley spoke about the need to meet with property owners about forming a benefit assessment district going forward, that the long-term solution is retreat, and managed retreat won’t be paid for by the County (meaning other county taxpayers).
2017: County had initially proposed a retaining wall system and one-way traffic for Mirada Rd erosion protection, but did not pursue the project after unfavorable review by Coastal Commission staff and US Army Corps of Engineers.
2020: Public Works Director Jim Porter said at Aug 12 MCC meeting that the County stepped back from working on Mirada Rd and will be looking to the newly formed SMC Flood & Sea Level Rise Resiliency District (One Shoreline) for solutions, to protect or retreat. This new county-wide District has a very small staff and has no current plans to take on Mirada Rd or bridge replacement.
California Coastal Commission (CCC) recent local coastal armoring decisions
No seawall to protect Coastal Trail south of Mirada Rd:
Just south of Arroyo de en Medio, the existing unpermitted section of riprap around the parking lot of the 3-story apartment building is the subject of a separate CCC enforcement action.
No armoring of creek banks: Aug 2020 CCC decision on appeal of Moss Beach bluff-top house (staff report) included prohibition of future armoring of the adjacent steep banks of Dean Creek ravine which fall under the LCP definition of coastal bluff (just as do the banks at the mouth of Arroyo de en Medio).
MIRADA ROAD BRIDGE
County Dept of Public Works (DPW) page for bridge replacement
The concrete arch bridge over Arroyo de en Medio Creek was built in 1917, and was closed to vehicles after completion of Hwy 1 in the late 1950’s.
A steel pedestrian bridge was installed over the top of the failing concrete bridge in 2003, which served as the Coastal Trail until abruptly closed as unsafe in July 2020. Construction of a replacement bridge is not expected until summer 2021 at the earliest. Construction of the Parallel Trail bike/pedestrian bridge on the east side of Hwy 1 is expected in summer 2021 with a trail from Coronado in El Granada south to the HMB city limit at Mirada/Alto Roads where it will connect with an extension of HMB’s parallel trail. Until then, the only north/south route over Arroyo de en Medio for all users is Hwy 1.
2001-10-09: MCC P&Z Committee comment on permit application to construct steel pedestrian bridge over the top of the failing concrete Mirada Road Bridge: Agree it would have no impact on creek corridor or beach area and would like to ensure that no riprap is added. Encourage Granada Sanitary District to re-route the sewer line off the bridge, and County to eventually remove the arch structure to allow the creek bed to be full-sized and unobstructed.
2017/04/03: Permit application #2-17-0289 to Coastal Commission (CCC) to construct soil nail reinforced, sculpted shotcrete walls to address the eroding shoreline at the pedestrian bridge over Arroyo de en Medio. See 4/13/18 Sand Supply Study for project details. Filing status incomplete and application withdrawn 6/3/20.
2018 summer: Structural engineering evaluation of bridge estimated two more years of life (oral report by DPW at MCC 8/12/20 meeting after bridge closure).
2019-03-26: Grant application to State Parks Division of Boating and Waterways for $1,463,765 for Mirada Rd Pedestrian Bridge replacement and bank stabilization project (not funded).
2020-06-03: Permit application submittal to Coastal Commission: DPW asks to withdraw 2017 Permit app #2-17-0289 (soil-nail walls north & south of bridge) and submit new CDP application to include replacement of the pedestrian bridge, and hybrid armoring consisting of shotcrete walls with tieback anchors as well as rock slope protection along the northern and southern banks of Arroyo de en Medio. These previously unreleased documents were obtained from CCC in Oct 2020:
2020-07-15: CCC letter: incomplete CDP App #2-20-0319 (Mirada Road Soil Nail Wall and Pedestrian Bridge Replacement). Additional info needed, including as-built plans for the two 2016 emergency riprap projects on Mirada Rd.
2020-07-27: Bridge closed as unsafe: press release
2020-08-10: DPW letter provides additional info to CCC.
2020-08-12: MCC agenda item on Mirada Rd bridge & detour (bridge condition, detour, minutes, video @17min)
2020-09-17: CCC letter asks for additional details and evaluation of Alternative 2 (relocate bridge to Alameda) and 4 (current location), rerouting of sewer line, and info/permits on existing riprap along the base of the creek inland from the bridge.
2020-09-21: Detour safety improvements on Hwy 1 completed: Reduce # lanes from 3 to 2, add K-rail & crash cushions to protect west side bike/ped detour area.
Thanks to exMCC’s Lisa Ketcham for an incredibly well curated website archive on local planning issues.
Midcoast Community Council (MCC) is an elected Municipal Advisory Council to the San Mateo County Board of Supervisors, representing Montara, Moss Beach, El Granada, Princeton, and Miramar.
Regular MCC meetings are on the 2nd & 4th Wednesday of the month at 7:00 PM at Granada Community Services District (GCSD) meeting room, 504 Ave Alhambra, third floor, El Granada. All MCC meetings are open to the public, and are agendized and posted according to the requirements of the Brown Act.
Agenda item supporting documents are available 72 hours in advance of meetings on http://www.MidcoastCommunityCouncil.org. Minutes from previous meetings on http://www.midcoastcommunitycouncil.org/2017-2018/ To subscribe to MCC agendas via email, send email to MCC-Agendasfirstname.lastname@example.org
Midcoast Community Council
Len Erickson, Chair – Term Ends: Dec. 2022
Michelle Weil, Vice Chair – Term Ends: Dec. 2022
Claire Toutant, Secretary – Term Ends: Dec. 2022
Dan Haggerty, Member – Term Ends: Dec. 2020
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Barbra Mathewson, Member – Term Ends: Dec. 2020
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