Scientific Investigations Report 2005

Assessment of Hydrologic and Water Quality Data Collected in Abbotts Lagoon Watershed, Point Reyes National Seashore, California, during Water Years 1999 and 2000

By Charles R. Kratzer, Dina K. Saleh and Celia Zamora

Scientific Investigations Report 2005–5261, published 2006.

Table 1

Sampling sites, drainage areas, and land use in Abbotts Lagoon watershed.

[ID, identification; NA, not applicable; mi², square mile]

Site no. (see fig. 1)	Site name	Site ID	Basin area (mi²)	Native vegetation	Sand dunes	Water	Silage	Grazing (general)	Grazing (permanent)	Grazing (seasonal)	Dairy/ranching (impacted)
				Land use, percentage of basin area
L1	Abbotts Lagoon, upper small lagoon	380736122562401	1.92	22.1	0.0	0.7	29.1	5.0	7.3	29.7	6.1

L2	Abbotts Lagoon, middle lagoon	380717122564101	2.47	22.4	0.4	3.2	21.4	24.2	4.7	19.3	4.3

L3	Abbotts Lagoon, lower lagoon	380652122570501	5.29	13.5	5.9	6.2	14.1	44.5	2.7	10.8	2.4

T1	Unnamed tributary 1 to Upper Abbotts Lagoon	380738122560701	0.98	18.2	0.0	0.0	17.9	8.7	8.2	46.9	0.0

T2	Unnamed tributary 2 to Upper Abbotts Lagoon	380753122561501	0.18	49.0	0.0	0.0	14.0	0.0	11.3	0.0	25.6

T3	Unnamed tributary 3 to Upper Abbotts Lagoon	380752122562501	0.07	2.0	0.0	0.0	26.7	0.0	0.0	34.0	37.3

T4	Unnamed tributary 4 to Middle Abbotts Lagoon	380722122561601	0.12	4.2	0.0	0.0	31.2	64.6	0.0	0.0	0.0

T5	Unnamed tributary 5 to Middle Abbotts Lagoon	380708122563501	0.05	0.7	0.0	0.0	0.0	99.3	0.0	0.0	0.0

T6	Unnamed tributary 6 to Lower Abbotts Lagoon	380642122563601	0.42	0.0	0.0	0.0	0.0	97.6	0.0	0.0	2.4

T7	Unnamed tributary 7 to Lower Abbotts Lagoon	380633122564001	0.62	0.0	0.0	0.0	0.2	99.8	0.0	0.0	0.0

T1–T7	Total drainage area for tributaries T1—T7	NA	2.44	11.2	0.0	0.0	10.6	50.9	4.1	19.8	3.4

L3 minus water and tributaries T1–T7	Abbotts basin land area not in tributary basins	NA	2.52	17.5	12.4	0.0	19.3	44.1	1.7	3.5	1.8