Tunnel No. 1 Control Shaft

Tunnel No. 1 Control Shaft (HM1D4O)

Location: Oakland, CA 94605 Alameda County
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Country: United States of America
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N 37° 43.811', W 122° 7.435'

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Lake Chabot Historical Walk

The stone structure before you is a 157 foot vertical control shaft. It joins to Tunnel No. 1 to open and close the flow of water running through the tunnel pipes. Two known accidents took place at this site. Tunnel No. 1 collapsed on two Chinese workers in 1874 causing an uproar in the camp. In 1875, when water was forced down the control shaft to dislodge debris, four Chinese laborers were washed out of the tunnel. Although injured, the four survived.

San Leandro Plaindealer of 1874 described the bustling activities on this hill: "The glare of the forge, the ring of the smith's hammer, the noise of the wheelwright's saw, the hurrying to and fro of busy men, all going to make up a picture, to the visitor, exceedingly interesting, and giving him to understand that a grand site is being achieved there."

The first superintendent, Frank Boardman, lived in a cottage on this knoll. Frank's father, former Alameda County supervisor, William Boardman, was the dam's chief engineer who created its many building diagrams. He drew the plans for the two water supply tunnels that run through this hill.
HM NumberHM1D4O
Year Placed2012
Placed ByEast Bay Regional Park District
Marker ConditionNo reports yet
Date Added Monday, October 20th, 2014 at 8:25am PDT -07:00
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Locationbig map
UTM (WGS84 Datum)10S E 577199 N 4176240
Decimal Degrees37.73018333, -122.12391667
Degrees and Decimal MinutesN 37° 43.811', W 122° 7.435'
Degrees, Minutes and Seconds37° 43' 48.66" N, 122° 7' 26.10" W
Driving DirectionsGoogle Maps
Area Code(s)510
Closest Postal AddressAt or near 20 Bass Cove Trail, Oakland CA 94605, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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