San Pablo Bay -- Cataloging Unit 18050002

• San Francisco Bay Subregion 1805
  
• California Region 18 (There are 135 cataloging units in this region.)
  The state composition by area is 100.0% California.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 3123.7 km² ( 1206.6 mi² ) [% in USA = 49.36, % in Region = 68.89]
  The area from the USGS is 1200 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 2296)

  IV. Elevation Analysis

  This analysis is based on 1246665 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 132.7 m ( 435.4 ft ) [% in USA = 18.38, % in Region = 12.59]
  The elevation standard deviation is 165.8 m ( 544.0 ft ) [% in USA = 66.70, % in Region = 17.78]
  The coefficient of variation is 124.9 %.
  The vertical relief is 1110.6 m ( 3643.7 ft ) [% in USA = 68.21, % in Region = 21.48]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	0.0	0.0	0.0	12.0	34.3	60.0	109.7	167.8	245.0	392.0	1110.6
  feet	0.0	0.0	0.0	39.4	112.5	196.8	359.9	550.5	803.8	1286.1	3643.7

  

  V. Map Line Analysis

  Note- percentiles are for the feature density, not for the raw total lengths.
  

  line type	km	mi	km/km²	mi/mi²	% in USA	% in Region
  Perennial Shoreline	697.9	433.7	0.223	0.359	83.37	92.59
  Intermittent Shoreline	0.0	0.0	0.000	0.000	27.38	34.81
  Perennial Streams	1094.9	680.5	0.351	0.564	64.52	63.70
  Intermittent Streams	3.4	2.1	0.001	0.002	3.03	5.19
  Canals	1.6	1.0	0.001	0.001	41.83	27.41
  1° roads	244.7	152.1	0.078	0.126	95.59	89.63
  2° roads	17.5	10.9	0.006	0.009	21.93	81.48
  3° roads	247.7	153.9	0.079	0.128	64.57	82.96
  4° roads	6802.0	4227.4	2.178	3.504	94.55	83.70
  Total Roads	7311.8	4544.3	2.341	3.766	93.60	83.70
  Railroads	337.7	209.9	0.108	0.174	89.48	89.63
  Pipes and Powerlines	24.8	15.4	0.008	0.013	21.41	31.85

  
  Of the natural water in this HUC, 0.19% (by length) is intermittent [% in USA = 2.51, % in Region = 3.70]

  VI. Other sites

  • EPA- Surf Your Watershed - Index of Watershed Indicators
  • USGS- Science in Your Watershed - Selected Realtime Streamflow Stations
  • CTIC- Known Your Watershed

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  1999 SEPT 4, Last updated on 2003 JAN 23
  
  D.L. Gustafson, dlg@rapid.msu.montana.edu