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Buttermilk Bay Subwatershed Land Use and Nitrogen Loading

What is on this page

On this page we present summary statistics of land use in the Buttermilk Bay Subwatershed, estimates of nitrogen loading using various loading models, and detailed parcel information where available, as well as links to any current and historical reports on pollution in the watershed issued by the state, federal government, DEP, the Massachusetts Estuaries Project, non-profits, and independent scientists.

[UNDER CONSTRUCTION]

Watershed delineations

[UNDER CONSTRUCTION]

Nitrogen Loading and Land Use Spreadsheets

Summary Charts

Summary Land Use Statistics (BBNEP 2001 loading analysis)

Buttermilk Bay land cover in hectares (ha) and loading (kg)
	Landuse type	ha whole	ha lower	ha upper	sewered ha whole	sewered ha lower	sewered upper	N Loading (kg)
1	Cropland	27.1	27.1	0.0				546
2	Pasture	6.7	6.4	0.3				67
3	Forest	1596.8	925.1	671.8				232
4	Non-forested wetland	19.4	13.8	5.6				0
5	Mining	5.5	4.4	1.1				39
6	Open land	35.1	26.4	8.7				5
7	Participatory recreation	8.4	1.1	7.2				183
8	Spectator recreation	0.0	0.0	0.0				0
9	Water based recreation	2.8	2.3	0.5				20
10	R0: residential multi-family	7.6	7.6	0.0	0.4	0.4	0.0	639
11	R1: Residential- <1/4 acre lots	146.2	146.2	0.0	73.0	73.0	0.0	5759
12	R2: Residential- <1/4-1/2 acre lots	250.7	114.4	136.3	0.0	0.0	0.0	7921
13	R3: Residential- >1/2 acre lots	120.9	79.9	41.0	0.5	0.5	0.0	2073
14	Salt marsh	3.1	3.1	0.0				0
15	Commercial	7.2	7.2	0.0	0.0	0.0	0.0	876
16	Industrial	1.1	0.2	0.9	0.0	0.0	0.0	10
17	Urban open	5.4	3.0	2.4				1
18	transportation (maj. highways)	100.3	60.7	39.5				1367
19	Waste disposal	0.7	0.7	0.0				11
20	Water (ponds, other freshwater)	266.5	40.2	226.3				0
21	Woody perrenial (bogs, orchards, etc.)	0.0	0.0	0.0				0
22	NA	0.0	0.0	0.0				0
23	Cranberry Bog (part of #21	204.6	120.5	84.1				3342
24	Powerlines (part of #6)	24.2	10.3	13.9				3
25	Saltwater Beach (part of #9)	0.0	0.0	0.0				0
26	Golf (part of #7)	0.0	0.0	0.0				0
27	Tidal Salt Marsh (part of #14)	0.0	0.0	0.0				0
28	Irreg. Flooded Salt Marsh (part of #14)	0.0	0.0	0.0				0
29	Marina (part of #9)	0.0	0.0	0.0				0
30	New Ocean	0.0	0.0	0.0				0
31	Urban Public (part of #17)	0.0	0.0	0.0				0
32	transportation Facility (part of #18)	0.0	0.0	0.0				0
33	Heath (part of #17)	0.0	0.0	0.0				0
34	Cemetaries (part of #17)	0.0	0.0	0.0				0
35	Orchard (part of #21)	0.0	0.0	0.0				0
36	Nursery (part of #21)	0.0	0.0	0.0				0
37	Forested Wetland (part of #3)	0.0	0.0	0.0				0
	TOTAL LAND AREA (ha)	2573.8	1560.5	1239.6
	Major road length, km	8.8	5.9	2.9
	All Roads, km	121.2	77.8
	Secondary Road length, km	112.4	71.9	40.5				732
	Road Area (ha)	104.7	67.4	37.3				683
	Embayment area (ha)	214.00						1562
	Total Loading based on landuse, pre adjustments							25389
	Reported Area occupancy	2.2	2.2	2.2
	Predicted units (existing)	3115	2272	843	sewered units
	Actual units (1990 census)	3182	2449	733.0	777	777	0
	Roof+lawn loading from census units		3594	753	24.4%	31.7%	0.0%	4347
	Unit density (per acre)	0.5	0.6	0.3
	Predicted population (existing)	6791	4953	1837
	Actual population (1990 Census)	5592	4466	1126.0	824	824	0
	Population w/ seasonal adjustment	7155	6029	1126	1112	1112	0
	Septic loading from census pop. data							15403
	Actual/assumed annualized occupancy	2.2	2.5	1.5
	Total Loading based land use, census units, cenus pop, and actual roads							31504
	Animal units	10.0	0.0	10.0	0.0	115.9		81
	Point sources (MGD, ppm)		0.0	0.0				0
	Other Special:		0.0	0.0				0
	Sewering adjustment units		0	0
	Upper watershed adjustment (kg)							0
	Lower watershed adjustment (kg)							0
	Final Adjusted Loading, landuse/census based							31585