[Chuckaluck]

Originally Posted by BifRayRock

"Dimout Zones, 1942

Navigating the curves of Mulholland Drive can be challenging enough in daylight. But during World War II, the U.S. War Department imposed dimout regulations on many roads--including Mulholland--that were visible from the ocean, requiring motorists to drive with their headlights off at night. This 1942 map from the Automobile Club of Southern California archives shows where dimout regulations would be enforced, explains Auto Club historian Matthew W. Roth:

In the fall of 1942, Auto Club cartographers and U.S. Department of War officials surveyed the coast of Southern California to define the "dimout zone," where motorists were required to turn off their headlights. Designed to thwart enemy vessels off the coast, the dimout would make it more difficult to navigate using onshore landmarks and would eliminate the backlighting of potential targets. Using the Auto Club's standard map of Metropolitan Los Angeles, the survey team marked those roads and highways where the dimout would be enforced. The blue and yellow markings indicate the direction from which the particular road would be visible from the water.
http://www.kcet.org/updaily/socal_fo...ub_full_fs.jpg

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Notice listing for Cahuenga "Freeway" yet Arroyo Seco is labeled "Parkway." Does this mean that in AAA's eyes Cahuenga was the first to claim the Freeway designation?

No Monkey Island off the "Cahuenga Freeway", but this is understandable if the map dates from late '42-'43. Other animal attractions near Lincoln High School are clearly marked: Farms for Alligators and Ostriches, and the Zoological gardens.

Bixby Slough is prominently marked. Another infamously named slough seems to have been omitted. These sloughs were once considered excellent candidates for sewage runoff.

Something possibly overlooked on NLA is how politics coupled with marine flow/ocean currents and weather probably caused certain coastal properties to become less desirable and less valuable. The direct cause: sewage.


Previous sewage on NLA: http://forum.skyscraperpage.com/show...postcount=8119

From 1894 to 1925, raw sewage was dumped into the waters. The original treatment plant . . . was built in 1925 as a simple screening facility. This proved to be inadequate, however, and just after World War II plans and construction began for a full treatment facility.

Visitors to local beaches objected to raw sewage in their recreational waters and in response, the City of Los Angeles built and started operating the first treatment facility at the Hyperion site in 1925: a simple screening plant. This plant remained in operation until 1950.

The screening plant was not effective in preventing beach closures; highly polluted wastewater was still being discharged into near-shore waters. Just after the end of World War II, the City began to develop plans for a full secondary treatment plant at the Hyperion site. When the new Hyperion Treatment Plant opened in 1950, it included a full secondary treatment system and biosolids processing to produce a heat-dried fertilizer. It was among the first facilities in the world to capture energy from biogas by operating anaerobic digesters, which have yielded a fuel gas by-product for over 50 years. At the time, Hyperion was the first large secondary treatment plant on the West Coast, and one of the most modern facilities in the world. http://www.lasewers.org/treatment_plants/hyperion/

Did trolley's refused service to those who unfortunately took a dip in Santa Monica Bay at an inopportune moment? Could have been a long ride/walk home. Wonder when LA Health Officials began closing beaches due to contamination or even suspected contamination? LA Sewers site mentions Ocean outfall at different ranges, five and seven miles in the Pacific. http://www.lasewers.org/treatment_plants/hyperion/


In 1891, LA apparently had a "Zanjero" and "Health Officer". Report of a vile smell and terrible stench from a zanja near Georgia and Second Streets. Sure case for Scarlet Fever! http://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=LAH18910306.2.23


1920s - El Segundo "Sewage Pier."
http://www.sewerhistory.org/images/w...rion_plant.jpg


Nice sized sewer pipe and potential Model-T garage. "Honk if you like sewage!"
http://www.sewerhistory.org/images/w...ll_Segment.JPG



1924 - El Segundo Sewer outflow.
http://jpg3.lapl.org/pics46/00072976.jpg


1937 - Sewage treatment construction in El Segundo. Source indicates this was part of an experiment underwritten by the Fed Govt.
http://www.sewerhistory.org/images/w...0s_workers.jpg



1947 - El Segundo - Original treatment plant with initial construction for '50 operation.


http://jpg3.lapl.org/pics48/00073816.jpghttp://jpg3.lapl.org/pics48/00073807.jpg


https://encrypted-tbn0.gstatic.com/i...i-KUEPi4KeulFd


http://www.sewerhistory.org/images/w..._BRACMap1A.jpg


Vast amount of historical sewage talk here:http://www.sewerhistory.org/grfx/trtmnt/trtmnt1.htm