Lake Arrowhead: 86.5% full as of 2017-09-21

The elevation-storage rating curve used to produce the storage hydrograph is made of two segments: (1) the segment up to the conservation pool top (below the red line) is based on measured data, and (2) the segment in the flood pool (above the red line) is an extrapolation from the first segment and shouldn't be relied upon for flood storage information.

Historical Data

Date Percent Full Mean Water Level
(ft)
Reservoir Storage
(acre-ft)
Conservation Storage
(acre-ft)
Conservation Capacity
(acre-ft)
Surface Area
(acres)
Today 2017-09-21 86.5 923.76 199,161 199,161 230,359 13,351
Yesterday 2017-09-20 86.5 923.77 199,294 199,294 230,359 13,356
2 days ago 2017-09-19 86.1 923.70 198,360 198,360 230,359 13,320
1 week ago 2017-09-14 86.3 923.73 198,760 198,760 230,359 13,335
1 month ago 2017-08-21 88.7 924.14 204,271 204,271 230,359 13,547
3 months ago 2017-06-21 93.3 924.91 214,854 214,854 230,359 13,944
6 months ago 2017-03-21 98.4 925.74 226,606 226,606 230,359 14,372
1 year ago 2016-09-21 91.1 924.55 209,869 209,869 230,359 13,758
*

Percent Full is based on Conservation Storage and Conservation Capacity and doesn't account for storage in flood pool.

**

   Values above, including today's are averaged conditions. For near real-time instantaneous water level, see table below or the interactive map viewer.

Most Recent Instantaneous Water Level

Date/time Water Level
(ft)
Conservation Pool Elevation
(ft)
Height Above Conservation Pool
(ft)
Most recent 2017-09-21 08:00 923.77 926.0 -2.2 below flood pool
1 hour prior 2017-09-21 07:00 923.76 926.0 -2.2 below flood pool
2 hours prior 2017-09-21 06:00 923.77 926.0 -2.2 below flood pool
6 hours prior 2017-09-21 02:00 923.76 926.0 -2.2 below flood pool
12 hours prior 2017-09-20 20:00 923.77 926.0 -2.2 below flood pool
24 hours prior 2017-09-20 08:00 923.76 926.0 -2.2 below flood pool
48 hours prior 2017-09-19 08:00 923.68 926.0 -2.3 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1966-01-01
Vertical datum NGVD29
Gauge USGS:07314800
Dead pool elevation 874.0 ft above NGVD29
Service spillway crest elevation 926.0 ft above NGVD29
Maximum design elevation 939.5 ft above NGVD29
Top of dam elevation 944.0 ft above NGVD29
Conservation pool elevation 926.0 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

2001-06-01 (source: twdb) : GIS Data
2013-09-01 (source: twdb) : GIS Data

Lake Location