The Dec. 25-26 rainfall total between 9:53 p.m. and 3:53 a.m. was 1.94," significantly higher than than 1.18" inchs for the same eix hour period in the Dec. 22-Dec. 23 storm. By comparison, 1.55" of rain fell within just four hours between 9:53 p.m. and 1:53 a.m. Dec. 25-26. Below are the hour by hour rainfall figures recorded by the Nat'l Weather Service (monitor at LGB.)

For the period between Dec. 25 (9:53 p.m.) and Dec. 26 (3:53 a.m.):

9:53 p.m. - 10:53 p.m.: 0.35"

10:53 p.m.- 11:53 p.m.: 0.39"

11:53 p.m.- 12:53 a.m.: 0.35"

12:53 a.m.- 1:53 a.m.: 0.46"

1:53 a.m. - 2:53 a.m.: 0.26"

2:53 a.m. - 3:53 a.m.: 0.13"

Total for six hour period: 1.94"

From Oct. 1 through Dec. 26 at 3:53 a.m., the Nat;l Weather Service says LGB received a total 7.49 inches of rain.

LBREPORT.com readers saw the two intense storms coming with updated forecasts and in-motion Nat'l Weather Service Doppler Radar on our front page: www.LBREPORT.com. (LBREPORT.com also maintains a permanent Weather tab at this link on our front page with access to this and more.)

The Nat'l Weather Service forecasts rain before 10 a.m. then showers through 4 p.m.(80% chance) easing off to a 20% chance before 10 p.m...and then sunny on Friday.

[Scroll down for further.]:

With intense rain across the 815 sq. miles L.A. County drainage area, the L.A. river rose to 10.39 feey. considerably above the 6.61 feet it reached on Dec. 23.

In both cases, this was still well below the L.A. river's "flood stage" just south of Wardlow Rd. (the maximum drainage point for the entire 815 sq. mile L.A. County drainage area.) However it shows the extent to which a sizable downpour over a few hour period can affect the L.A. River flow.

NOAA website
NOAA website

As LBREPORT.com reported after the Dec. 22-Dec 23 rain, some storms stretch much further into the Pacific and last for days (including the "Pineapple Express" and "atmospheric rivers.") In addition, by January and February, the ground is often saturated from previous rainfall, sending more runoff into the L.A. river and ultimately into LB.

Yet to date Long Beach's policy-setting City Council hasn't publicly date discussed the impacts on the L.A. River's carrying capacity that would result from a project proposed by Mayor Robert Garcia.

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As part of plans to widen the I-710 freeway and build a new bridge connecting the freeway with downtown LB, Garcia has proposed a concept similar to New York City's "High Line" park (which reused a former elevated RR bridge as a park). Mayor Garcia has proposed to retain the existing Shoemaker Bridge and turn it into a pedestrian park like trail. LBREPORT.com has called the idea intriguing and worthy of exploration, but has also raised cautions about its impacts on the L.A. River's capacity to handle major storms and increased runoff (the latter expected to increase as future development locally and upriver paves over previously permeable surfaces.)

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Putting a new bridge in the L.A. River while retaining the current bridge would increase the number of obstructive pilings/piers in the river channel and reduce the river channel's carrying capacity. (NYC's High Line RR bridge is in Manhattan, not across a river.) The I-710 bridge's EIR acknowledges these impacts but downplays them, calling them not significant and minimizing any increased flood risk, but the impacts are visible on a close reading of the text and data (described in LBREPORT.com's coverage at this link.,

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In addition, the new bridge's proposed design has morphed from the iconic gateway project described by LB's now former Public Works Director (who exited LB for Pasadena) into what now arguably appears to be basically a conventional freeway connector. (The design also proposes "traffic calming" [slowing] elements that haven't been seriously discussed publicly at this point. LBREPORT.com wonders how many taxpayers favor installing a "roundabout" or a "Y" intersction" at the downtown/eastern end of the I-710 connecting bridge.)

To view LBREPORT.com previous report New Shoemaker Bridge -- Proposed As Iconic New Entrance To Downtown LB -- Might End Up Considerably Less; City Council (Including Its "I-710 Oversight Committee") Hasn't Paid Attention And Some LB Media Outlets Haven't Told You These Details. click here.

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