Upper St. Johns -- Cataloging Unit 03080101

• St. Johns Accounting Unit 030801
  
• St. Johns Subregion 0308
  
• South Atlantic-Gulf Region 03 (There are 198 cataloging units in this region.)
  The state composition by area is 100.0% Florida.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 8916.6 km² ( 3444.2 mi² ) [% in USA = 97.06, % in Region = 99.49]
  The area from the USGS is 3700 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 2375)

  IV. Elevation Analysis

  This analysis is based on 3563368 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 13.1 m ( 43.0 ft ) [% in USA = 3.55, % in Region = 16.16]
  The elevation standard deviation is 9.4 m ( 30.8 ft ) [% in USA = 4.26, % in Region = 16.67]
  The coefficient of variation is 71.8 %.
  The vertical relief is 55.0 m ( 180.4 ft ) [% in USA = 4.26, % in Region = 18.69]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	0.0	2.0	5.0	7.0	8.0	12.0	15.0	17.4	21.5	24.0	55.0
  feet	0.0	6.6	16.4	23.0	26.2	39.4	49.2	57.1	70.5	78.7	180.4

  

  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	4455.5	2769.1	0.500	0.804	96.07	89.90
  Intermittent Shoreline	83.6	51.9	0.009	0.015	84.51	87.88
  Perennial Streams	1974.2	1227.0	0.221	0.356	43.49	13.64
  Intermittent Streams	98.7	61.4	0.011	0.018	7.01	10.61
  Canals	1712.0	1064.0	0.192	0.309	96.78	93.43
  1° roads	259.4	161.2	0.029	0.047	79.06	71.72
  2° roads	208.1	129.3	0.023	0.038	46.38	9.09
  3° roads	765.6	475.8	0.086	0.138	67.60	31.82
  4° roads	13801.1	8577.4	1.548	2.490	80.63	65.15
  Total Roads	15034.1	9343.8	1.686	2.713	79.58	61.62
  Railroads	297.5	184.9	0.033	0.054	42.44	12.63
  Pipes and Powerlines	142.0	88.3	0.016	0.026	32.50	10.61

  
  Of the natural water in this HUC, 2.76% (by length) is intermittent [% in USA = 8.38, % in Region = 9.09]

  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