Table 2-1. Long-term trends in total nitrogen, through water year 2012.

[POR, period of record; mg/L, milligrams per liter; kg day–1, kilograms per day; kg day–1 km–2, kilograms per day per square kilometer]

Station abbreviation Station ID Station name Start year

Trends in concentration Trends in flux 

POR Per year POR Per y

mg/L percent mg/L percent kg day–1 percent kg day–1 

CHOP 01491000 CHOPTANK RIVER NEAR GREENSBORO, MD 1985 0.261 15.7 0.010 0.581 13 2.1 0.482 

SRTW 01531500 SUSQUEHANNA RIVER AT TOWANDA, PA 1985 –0.581 –41.9 –0.022 –1.55 –19,400 –44 –718 

SRWB 01536500 SUSQUEHANNA RIVER AT WILKES-BARRE, PA 1989 –1.02 –56 –0.045 –2.43 –35,300 –50.5 –1,540 

SRDA 01540500 SUSQUEHANNA RIVER AT DANVILLE, PA 1985 –0.596 –40.5 –0.022 –1.5 –27,500 –40 –1,020 

WBSL 01553500 WEST BRANCH SUSQUEHANNA RIVER AT 

LEWISBURG, PA

1985 –0.373 –30.6 –0.014 –1.13 –12,100 –36.1 –447 

JUNI 01567000 JUNIATA RIVER AT NEWPORT, PA 1985 –0.49 –25.9 –0.018 –0.959 –7,560 –31 –280 

SRMA 01576000 SUSQUEHANNA RIVER AT MARIETTA, PA 1987 –0.535 –31 –0.021 –1.24 –72,900 –36.7 –2,920 

CONE 01576754 CONESTOGA RIVER AT CONESTOGA, PA 1985 –2.1 –23.9 –0.078 –0.885 –4,650 –30.6 –172 

SRCW 01578310 SUSQUEHANNA RIVER AT CONOWINGO, MD 1985 –0.567 –28.4 –0.021 –1.05 –49,100 –23.9 –1,820 

GUNP 01582500 GUNPOWDER FALLS AT GLENCOE, MD 1985 0.438 18.6 0.016 0.689 237 21 8.78 

NBPA 01586000 NORTH BRANCH PATAPSCO RIVER AT 

CEDARHURST, MD

1985 0.588 16.4 0.022 0.607 70.6 12.5 2.62 

PAXU 01591000 PATUXENT RIVER NEAR UNITY, MD 1985 0.363 14 0.014 0.519 –7.33 –2.5 –0.271 

PAXB 01594440 PATUXENT RIVER AT BOWIE, MD 1985 –3.08 –65.1 –0.114 –2.41 –2,000 –57.7 –74.1 

GEOR 01599000 GEORGES CREEK AT FRANKLIN, MD 1985 –0.816 –45 –0.030 –1.67 –145 –35.1 –5.38 

WILL 01601500 WILLS CREEK NEAR CUMBERLAND, MD 1985 –0.628 –49.4 –0.023 –1.83 –758 –44.1 –28.1 

CONC 01614500 CONOCOCHEAGUE CREEK AT FAIRVIEW, MD 1985 –0.148 –3.2 –0.005 –0.119 –104 –1.5 –3.86 

ANTS 01619500 ANTIETAM CREEK NEAR SHARPSBURG, MD 1985 –0.501 –9.5 –0.019 –0.352 –469 –11.8 –17.4 

SFSF 01631000 S F SHENANDOAH RIVER AT FRONT ROYAL, VA 1985 –0.574 –35.7 –0.021 –1.32 –507 –7.6 –18.8 

NFSH 01634000 N F SHENANDOAH RIVER NEAR STRASBURG, VA 1985 0.14 9.8 0.005 0.363 642 24.3 23.8 

CATM 01637500 CATOCTIN CREEK NEAR MIDDLETOWN, MD 1985 –0.3 –16.1 –0.011 –0.596 –48.2 –11 –1.78 

MONO 01639000 MONOCACY RIVER AT BRIDGEPORT, MD 1985 –0.78 –31.6 –0.029 –1.17 –930 –41.8 –34.5 

POTC 01646580 POTOMAC RIVER AT CHAIN BRIDGE, AT 

WASHINGTON, DC

1985 –0.311 –17.6 –0.012 –0.652 –12,100 –17.8 –450 

RPHF 01668000 RAPPAHANNOCK RIVER NEAR 

FREDERICKSBURG, VA

1985 –0.378 –34.4 –0.014 –1.27 –1,420 –22 –52.7 

NANN 01671020 NORTH ANNA RIVER AT HART CORNER NEAR 

DOSWELL, VA

1985 0.003 0.7 0.000 0.026 45.3 10 1.68 

PAMU 01673000 PAMUNKEY RIVER NEAR HANOVER, VA 1985 0.050 6.9 0.002 0.256 71.2 3.9 2.64 

MABU 01674500 MATTAPONI RIVER NEAR BEULAHVILLE, VA 1985 –0.131 –19 –0.005 –0.704 –152 –16.7 –5.64 

JAMC 02035000 JAMES RIVER AT CARTERSVILLE, VA 1985 –0.284 –35.2 –0.011 –1.3 –998 –6.2 –37 

JAMR 02037500 JAMES RIVER NEAR RICHMOND, VA 1985 –0.121 –20.1 –0.004 –0.744 –635 –4.4 –23.5 

APPM 02041650 APPOMATTOX RIVER AT MATOACA, VA 1985 –0.026 –4 –0.001 –0.148 –264 –13.7 –9.77 

CHIC 02042500 CHICKAMOMINY RIVER NEAR PROVIDENCE 

FORGE, VA

1985 –0.076 –11.9 –0.003 –0.441 –23.2 –5.4 –0.858 
Table 2-2. Long-term trends in total phosphorus, through water year 2012.

[POR, period of record; mg/L, milligrams per liter; kg day–1, kilograms per day; kg day–1 km–2, kilograms per day per square kilometer; E, estimated]

Station 

abbreviation Station ID Station name Start year

Trends in concentration Trends in flux 

POR Per year POR Per y

mg/L percent mg/L percent kg day–1 percent kg day–1 

CHOP 01491000 CHOPTANK RIVER NEAR GREENSBORO, MD 1985 0.030 45.8 0.001 1.7 17.4 53.3 0.645 

SRTW 01531500 SUSQUEHANNA RIVER AT TOWANDA, PA 1985 –0.053 –49.7 –0.002 –1.84 –1,400 –38.9 –52 

SRWB 01536500 SUSQUEHANNA RIVER AT WILKES-BARRE, PA 1985 –0.092 –65.2 –0.003 –2.41 –2,290 –38.8 –84.7 

SRDA 01540500 SUSQUEHANNA RIVER AT DANVILLE, PA 1985 –0.067 –56.1 –0.002 –2.08 –2,700 –42.2 –100 

WBSL 01553500 WEST BRANCH SUSQUEHANNA RIVER AT 

LEWISBURG, PA

1985 –0.056 –72.8 –0.002 –2.7 –1,260 –59.3 –46.7 

JUNI 01567000 JUNIATA RIVER AT NEWPORT, PA 1985 –0.073 –67.1 –0.003 –2.49 –856 –58.4 –31.7 

SRMA 01576000 SUSQUEHANNA RIVER AT MARIETTA, PA 1987 –0.046 –49.5 –0.002 –1.98 –4,570 –37.7 –183 

CONE 01576754 CONESTOGA RIVER AT CONESTOGA, PA 1985 –0.413 –68.4 –0.015 –2.53 –813 –62 –30.1 

SRCW 01578310 SUSQUEHANNA RIVER AT CONOWINGO, MD 1985 –0.010 –16.9 –0.000 –0.626 2,710 40.8 100 

GUNP 01582500 GUNPOWDER FALLS AT GLENCOE, MD 1985 –0.021 –35.1 –0.001 –1.3 –19.3 –40.3 –0.713 

NBPA 01586000 NORTH BRANCH PATAPSCO RIVER AT 

CEDARHURST, MD

1985 –0.075 –64.5 –0.003 –2.39 –52.3 –75.5 –1.94 

PAXU 01591000 PATUXENT RIVER NEAR UNITY, MD 1985 –0.089 –67.6 –0.003 –2.5 –18.4 –57 –0.681 PAXB 01594440 PATUXENT RIVER AT BOWIE, MD 1985 –0.315 –75.2 –0.012 –2.79 –231 –62.8 –8.56 

GEOR 01599000 GEORGES CREEK AT FRANKLIN, MD 1985 –0.12 –78.1 –0.004 –2.89 –9.9 –42.5 –0.367 

WILL 01601500 WILLS CREEK NEAR CUMBERLAND, MD 1985 –0.022 –46.2 –0.001 –1.71 –47.9 –45.3 –1.77 

CONC 01614500 CONOCOCHEAGUE CREEK AT FAIRVIEW, MD 1985 –0.164 –67 –0.006 –2.48 –141 –42.4 –5.23 

ANTS 01619500 ANTIETAM CREEK NEAR SHARPSBURG, MD 1985 –0.191 –63.5 –0.007 –2.35 –95.5 –42.3 –3.54 SFSF 01631000 S F SHENANDOAH RIVER AT FRONT ROYAL, VA 1996 –0.072 –54.9 –0.005 –3.43 601 119 37.6 NFSH 01634000 N F SHENANDOAH RIVER NEAR STRASBURG, VA 1996 –0.036 –41.3 –0.002 –2.58 163 102.4 10.2 CATM 01637500 CATOCTIN CREEK NEAR MIDDLETOWN, MD 1985 –0.093 –59.4 –0.003 –2.2 –4.5 –12.2 –0.167 MONO 01639000 MONOCACY RIVER AT BRIDGEPORT, MD 1985 –0.136 –54.9 –0.005 –2.03 –33.1 –20.7 –1.23 POTC 01646580 POTOMAC RIVER AT CHAIN BRIDGE, AT 

WASHINGTON, DC

1985 –0.059 –47.8 –0.002 –1.77 –2,640 –37.5 –97.8 

RPHF 01668000 RAPPAHANNOCK RIVER NEAR 

FREDERICKSBURG, VA

1985 –0.015 –16.1 –0.001 –0.596 369 50 13.7 

NANN 01671020 NORTH ANNA RIVER AT HART CORNER NEAR 

DOSWELL, VA

1994 0.006 26.9 0.000 1.49 34.5 122.9 1.91 

PAMU 01673000 PAMUNKEY RIVER NEAR HANOVER, VA 1985 0.038 77 0.001 2.85 130 103.6 4.83 MABU 01674500 MATTAPONI RIVER NEAR BEULAHVILLE, VA 1985 0.004 7.4 0.000 0.274 0.51 0.7 0.019 

JAMC 02035000 JAMES RIVER AT CARTERSVILLE, VA 1985 –0.212 –74.3 –0.008 –2.75 –630 –13.6 –23.3 

JAMR 02037500 JAMES RIVER NEAR RICHMOND, VA 1994 –0.036 –36.1 –0.002 –2.01 631 25.5 35 

APPM 02041650 APPOMATTOX RIVER AT MATOACA, VA 1985 0.020 68.4 0.001 2.53 67.6 70.8 2.5 

CHIC 02042500 CHICKAMOMINY RIVER NEAR PROVIDENCE 

FORGE, VA

1985 0.002 2.5 6.95E-5 0.093 13.5 31.4 0.499 
Table 2-3. Long-term trends in sediment, through water year 2012.

[POR, period of record; mg/L, milligrams per liter; kg day–1, kilograms per day; kg day–1 km–2, kilograms per day per square kilometer; SSC, suspended-sediment concentration; 

Station 

abbreviation Station ID Station name Start year Con- stitu- ent

Trends in concentration Trends in flux 

POR Per year POR Per y

mg/L percent mg/L percent kg day–1 percent kg day–1 

CHOP 01491000 CHOPTANK RIVER NEAR GREENSBORO, MD 1985 SSC –1.38 –12.5 –0.051 –0.463 –27.4 –0.4 –1.02 

SRTW 01531500 SUSQUEHANNA RIVER AT TOWANDA, PA 1989 SSC –14.4 –35.6 –0.626 –1.55 –1,990,000 –47.8 –86,500 

SRDA 01540500 SUSQUEHANNA RIVER AT DANVILLE, PA 1985 SSC –24.4 –47 –0.902 –1.74 –3,510,000 –49.8 –130,000 

WBSL 01553500 WEST BRANCH SUSQUEHANNA RIVER AT 

LEWISBURG, PA

1985 SSC –7.35 –38.5 –0.272 –1.43 –798,000 –50.7 –29,500 

JUNI 01567000 JUNIATA RIVER AT NEWPORT, PA 1985 SSC –16.3 –56.3 –0.604 –2.09 –536,000 –61.8 –19,900 

SRMA 01576000 SUSQUEHANNA RIVER AT MARIETTA, PA 1987 SSC –23.8 –49.8 –0.95 –1.99 –6,020,000 –51.5 –241,000 

CONE 01576754 CONESTOGA RIVER AT CONESTOGA, PA 1985 SSC –77.3 –71.4 –2.86 –2.64 –479,000 –74.9 –17,800 

SRCW 01578310 SUSQUEHANNA RIVER AT CONOWINGO, MD 1985 SSC 2.82 17.7 0.105 0.656 3,770,000 110.9 140,000 

GUNP 01582500 GUNPOWDER FALLS AT GLENCOE, MD 1985 TSS 19.5 232.6 0.723 8.61 23,000 241.9 851 

NBPA 01586000 NORTH BRANCH PATAPSCO RIVER AT 

CEDARHURST, MD

1985 TSS –74.2 –70.9 –2.75 –2.63 –187,000 –89.3 –6,940 

PAXU 01591000 PATUXENT RIVER NEAR UNITY, MD 1985 TSS 4.05 10.5 0.15 0.389 12,700 85.8 469 

PAXB 01594440 PATUXENT RIVER AT BOWIE, MD 1985 SSC –28 –41 –1.04 –1.52 –30,800 –29.4 –1,140 

GEOR 01599000 GEORGES CREEK AT FRANKLIN, MD 1985 TSS 26.4 99.1 0.979 3.67 22,000 209.4 814 

WILL 01601500 WILLS CREEK NEAR CUMBERLAND, MD 1985 TSS 12 69.4 0.444 2.57 123,000 199.8 4,570 

CONC 01614500 CONOCOCHEAGUE CREEK AT FAIRVIEW, MD 1985 TSS –8.05 –25.9 –0.298 –0.959 –85,000 –39.9 –3,150 

ANTS 01619500 ANTIETAM CREEK NEAR SHARPSBURG, MD 1985 TSS 3.61 14.5 0.134 0.537 12,000 23.2 444 

SFSF 01631000 S F SHENANDOAH RIVER AT FRONT ROYAL, VA 1985 TSS –0.993 –3.7 –0.037 –0.137 –619,000 –25.7 –22,900 

NFSH 01634000 N F SHENANDOAH RIVER NEAR STRASBURG, VA 1985 TSS 5.81 23.5 0.215 0.87 –96,700 –6.8 –3,580 

CATM 01637500 CATOCTIN CREEK NEAR MIDDLETOWN, MD 1985 TSS 19.2 207.1 0.712 7.67 51,100 562.6 1,890 

MONO 01639000 MONOCACY RIVER AT BRIDGEPORT, MD 1985 TSS –4.09 –21.8 –0.151 –0.807 15,600 39.4 578 

POTC 01646580 POTOMAC RIVER AT CHAIN BRIDGE, AT 

WASHINGTON, DC

1985 SSC –44.2 –58 –1.64 –2.15 –4,140,000 –51.2 –153,000 

RPHF 01668000 RAPPAHANNOCK RIVER NEAR 

FREDERICKSBURG, VA

1988 TSS –18.5 –39 –0.772 –1.62 –94,400 –13.8 –3,940 

NANN 01671020 NORTH ANNA RIVER AT HART CORNER NEAR 

DOSWELL, VA

1985 TSS 8.72 214.4 0.323 7.94 37,900 246.3 1,400 

PAMU 01673000 PAMUNKEY RIVER NEAR HANOVER, VA 1989 TSS 20.1 159.6 0.874 6.94 62,300 95.2 2,710 

MABU 01674500 MATTAPONI RIVER NEAR BEULAHVILLE, VA 1989 TSS 0.149 2.2 0.006 0.096 475 4 20.7 

JAMC 02035000 JAMES RIVER AT CARTERSVILLE, VA 1988 TSS 4.81 16.7 0.2 0.696 732,000 49.3 30,500 

JAMR 02037500 JAMES RIVER NEAR RICHMOND, VA 1985 TSS –1.73 –5.6 –0.064 –0.207 –343,000 –12.7 –12,700 

APPM 02041650 APPOMATTOX RIVER AT MATOACA, VA 1989 TSS 2.11 30.7 0.092 1.33 5,070 11.7 220 

CHIC 02042500 CHICKAMOMINY RIVER NEAR PROVIDENCE 

FORGE, VA

1985 TSS 3.01 57 0.112 2.11 3,820 76.5 142 
Table 2-4. Ten-year trends in total nitrogen, through water year 2012.

[POR, period of record; mg/L, milligrams per liter; kg day–1, kilograms per day; kg day–1 km–2, kilograms per day per square kilometer]

Station 

abbreviation Station ID Station name Start year

Trends in concentration Trends in flux 

POR Per year POR Per ye

mg/L percent mg/L percent kg day–1 percent kg day–1 

CHOP 01491000 CHOPTANK RIVER NEAR GREENSBORO, MD 2003 0.131 7.3 0.013 0.73 –6.46 –0.9 –0.646 

SRTW 01531500 SUSQUEHANNA RIVER AT TOWANDA, PA 2003 –0.259 –24.2 –0.026 –2.42 –8,130 –22.3 –813 

SRWB 01536500 SUSQUEHANNA RIVER AT WILKES-BARRE, PA 2003 –0.294 –26.6 –0.029 –2.66 –12,300 –24.3 –1,230 

SRDA 01540500 SUSQUEHANNA RIVER AT DANVILLE, PA 2003 –0.184 –17.2 –0.018 –1.72 –7,100 –12.9 –710 

WBSL 01553500 WEST BRANCH SUSQUEHANNA RIVER AT 

LEWISBURG, PA

2003 –0.307 –26.8 –0.031 –2.68 –8,520 –26.6 –852 

JUNI 01567000 JUNIATA RIVER AT NEWPORT, PA 2003 –0.434 –23.3 –0.043 –2.33 –5,490 –22.4 –549 

SRMA 01576000 SUSQUEHANNA RIVER AT MARIETTA, PA 2003 –0.638 –34.6 –0.064 –3.46 –60,500 –29.5 –6,050 

CONE 01576754 CONESTOGA RIVER AT CONESTOGA, PA 2003 –2.54 –27.8 –0.254 –2.78 –4,500 –26.8 –450 

SRCW 01578310 SUSQUEHANNA RIVER AT CONOWINGO, MD 2003 –0.45 –23.8 –0.045 –2.38 –54,500 –22.8 –5,450 

GUNP 01582500 GUNPOWDER FALLS AT GLENCOE, MD 2003 –0.028 –0.003 –0.1 –11.7 –0.8 –1.17 

NBPA 01586000 NORTH BRANCH PATAPSCO RIVER AT 

CEDARHURST, MD

2003 –0.305 –6.9 –0.031 –0.69 –54.2 –7.2 –5.42 

GWYN 01589300 GWYNNS FALLS AT VILLA NOVA, MD 2003 –0.251 –13.2 –0.025 –1.32 –24.1 –11.1 –2.41 

PAXU 01591000 PATUXENT RIVER NEAR UNITY, MD 2003 0.080 2.7 0.008 0.27 –0.63 –0.2 –0.063 

PAXB 01594440 PATUXENT RIVER AT BOWIE, MD 2003 –0.349 –17.6 –0.035 –1.76 –301 –15.4 –30.1 

GEOR 01599000 GEORGES CREEK AT FRANKLIN, MD 2003 –0.292 –22.4 –0.029 –2.24 –98.6 –24.2 –9.86 

WILL 01601500 WILLS CREEK NEAR CUMBERLAND, MD 2003 –0.441 –40 –0.044 –4 –734 –41.9 –73.4 

CONC 01614500 CONOCOCHEAGUE CREEK AT FAIRVIEW, MD 2003 –0.399 –8.1 –0.040 –0.81 –774 –9.1 –77.4 

ANTS 01619500 ANTIETAM CREEK NEAR SHARPSBURG, MD 2003 –0.061 –1.3 –0.006 –0.13 –135 –3.4 –13.5 

SOUT 01626000 SOUTH RIVER NEAR WAYNESBORO, VA 2003 –0.13 –14.4 –0.013 –1.44 –48.3 –15.5 –4.83 

SFSL 01628500 S F SHENANDOAH RIVER NEAR LYNNWOOD, VA 2003 –0.374 –17.9 –0.037 –1.79 –738 –12.5 –73.8 

SFSF 01631000 S F SHENANDOAH RIVER AT FRONT ROYAL, VA 2003 –0.348 –25 –0.035 –2.5 –1,030 –15.2 –103 

NFSH 01634000 N F SHENANDOAH RIVER NEAR STRASBURG, VA 2003 –0.102 –6 –0.010 –0.6 –117 –3.4 –11.7 

CATM 01637500 CATOCTIN CREEK NEAR MIDDLETOWN, MD 2003 –0.025 –1.5 –0.002 –0.15 –34.3 –7.7 –3.43 

CATT 01638480 CATOCTIN CREEK NEAR TAYLORSTOWN, VA 2003 –0.084 –7.1 –0.008 –0.71 –36.5 –8.9 –3.65 

MONO 01639000 MONOCACY RIVER AT BRIDGEPORT, MD 2003 –0.245 –12.3 –0.025 –1.23 –167 –10.2 –16.7 

POTC 01646580 POTOMAC RIVER AT CHAIN BRIDGE, AT 

WASHINGTON, DC

2003 –0.495 –24.8 –0.050 –2.48 –12,900 –17.7 –1,290 

ACCO 01654000 ACCOTINK CREEK NEAR ANNANDALE, VA 2003 –0.412 –31.9 –0.041 –3.19 –42.3 –29.4 –4.23 

RPHR 01664000 RAPPAHANNOCK RIVER AT REMINGTON, VA 2003 –0.229 –29.1 –0.023 –2.91 –318 –20.8 –31.8 

RPDR 01665500 RAPIDAN RIVER NEAR RUCKERSVILLE, VA 2003 –0.119 –19.4 –0.012 –1.94 –66.3 –24.8 –6.63 RPHF 01668000 RAPPAHANNOCK RIVER NEAR 

FREDERICKSBURG, VA

2003 –0.095 –11.3 –0.010 –1.13 –342 –5.9 –34.2 

NANN 01671020 NORTH ANNA RIVER AT HART CORNER NEAR 

DOSWELL, VA

2003 –0.091 –18.6 –0.009 –1.86 –92.3 –16 –9.23 
Table 2-4. Ten-year trends in total nitrogen, through water year 2012.—Continued

[POR, period of record; mg/L, milligrams per liter; kg day–1, kilograms per day; kg day–1 km–2, kilograms per day per square kilometer]

Station 

abbreviation Station ID Station name Start year

Trends in concentration Trends in flux 

POR Per year POR Per ye

mg/L percent mg/L percent kg day–1 percent kg day–1 

LITT 01671100 LITTLE RIVER NEAR DOSWELL, VA 2003 0.045 8.9 0.004 0.89 14.7 12.3 1.47 

PAMU 01673000 PAMUNKEY RIVER NEAR HANOVER, VA 2003 0.019 2.6 0.002 0.26 42.2 2.3 4.22 

PORV 01673800 PO RIVER NEAR SPOTSYLVANIA, VA 2003 0.025 5.5 0.003 0.55 5.17 3.9 0.517 

MABG 01674000 MATTAPONI RIVER NEAR BOWLING GREEN, VA 2003 –0.015 –3.1 –0.002 –0.31 –20.3 –5.8 –2.03 

MABU 01674500 MATTAPONI RIVER NEAR BEULAHVILLE, VA 2003 –0.068 –10.8 –0.007 –1.08 –75.4 –8.1 –7.54 

BACK 02011500 BACK CREEK NEAR MOUNTAIN GROVE, VA 2003 –0.074 –21.1 –0.007 –2.11 –47.5 –22 –4.75 

BULL 02015700 BULLPASTURE RIVER AT WILLIAMSVILLE, VA 2003 0.002 0.6 0.000 0.06 –8.6 –3.1 –0.86 

CALF 02020500 CALFPASTURE RIVER ABV MILL CREEK AT 

GOSHEN, VA

2003 –0.053 –15.5 –0.005 –1.55 –26.2 –11.6 –2.62 

MECH 02031000 MECHUMS RIVER NEAR WHITE HALL, VA 2003 –0.048 –8.7 –0.005 –0.87 3.37 1.9 0.337 

JAMC 02035000 JAMES RIVER AT CARTERSVILLE, VA 2003 –0.004 –0.8 –0.000 –0.08 1,510 11.4 151 

JAMR 02037500 JAMES RIVER NEAR RICHMOND, VA 2003 –0.017 –3.3 –0.002 –0.33 2,380 19.2 238 

APPF 02039500 APPOMATTOX RIVER AT FARMVILLE, VA 2003 0.094 22.7 0.009 2.27 112 30.2 11.2 

DEEP 02041000 DEEP CREEK NEAR MANNBORO, VA 2003 0.035 6.2 0.003 0.62 –9.17 –3.3 –0.917 

APPM 02041650 APPOMATTOX RIVER AT MATOACA, VA 2003 0.003 0.5 0.000 0.05 –162 –8.3 –16.2 

CHIC 02042500 CHICKAHOMINY RIVER NEAR PROVIDENCE 

FORGE, VA

2003 –0.077 –11.8 –0.008 –1.18 –20.7 –3.9 –2.07 
Table 2-5. Ten-year trends in total phosphorus, through water year 2012.

[POR, period of record; mg/L, milligrams per liter; kg day–1, kilograms per day; kg day–1 km–2, kilograms per day per square kilometer; E, estimated]

Station 

abbreviation Station ID Station name Start year

Trends in concentration Trends in flux 

POR Per year POR Per 

mg/L percent mg/L percent kg day–1 percent kg day–1 

CHOP 01491000 CHOPTANK RIVER NEAR GREENSBORO, MD 2003 0.023 30.2 0.002 3.02 17.1 34.8 1.71 

SRTW 01531500 SUSQUEHANNA RIVER AT TOWANDA, PA 2003 –0.013 –19 –0.001 –1.9 –410 –13.2 –41 

SRWB 01536500 SUSQUEHANNA RIVER AT WILKES-BARRE, PA 2003 –0.044 –44.8 –0.004 –4.48 –3,370 –41.9 –337 

SRDA 01540500 SUSQUEHANNA RIVER AT DANVILLE, PA 2003 –0.018 –23.9 –0.002 –2.39 –1,030 –17.8 –103 

WBSL 01553500 WEST BRANCH SUSQUEHANNA RIVER AT 

LEWISBURG, PA

2003 –0.017 –42.8 –0.002 –4.28 –563 –35.3 –56.3 

JUNI 01567000 JUNIATA RIVER AT NEWPORT, PA 2003 –0.026 –40.9 –0.003 –4.09 –525 –42.4 –52.5 

SRMA 01576000 SUSQUEHANNA RIVER AT MARIETTA, PA 2003 –0.027 –34.1 –0.003 –3.41 –4,550 –32.6 –455 

CONE 01576754 CONESTOGA RIVER AT CONESTOGA, PA 2003 –0.012 –5.6 –0.001 –0.56 –65.6 –9.5 –6.56 

SRCW 01578310 SUSQUEHANNA RIVER AT CONOWINGO, MD 2003 0.003 6.8 0.000 0.68 2,880 29.2 288 

GUNP 01582500 GUNPOWDER FALLS AT GLENCOE, MD 2003 0.012 38.5 0.001 3.85 10.4 39.7 1.04 

NBPA 01586000 NORTH BRANCH PATAPSCO RIVER AT 

CEDARHURST, MD

2003 0.010 29.2 0.001 2.92 4.03 25.9 0.403 

GWYN 01589300 GWYNNS FALLS AT VILLA NOVA, MD 2003 0.006 17.8 0.001 1.78 3.48 33.8 0.348 

PAXU 01591000 PATUXENT RIVER NEAR UNITY, MD 2003 0.014 40.9 0.001 4.09 11.4 130.9 1.14 

PAXB 01594440 PATUXENT RIVER AT BOWIE, MD 2003 0.009 9 0.001 0.9 33.7 24.2 3.37 

GEOR 01599000 GEORGES CREEK AT FRANKLIN, MD 2003 –0.026 –42.3 –0.003 –4.23 1.06 7 0.106 

WILL 01601500 WILLS CREEK NEAR CUMBERLAND, MD 2003 –0.000 –0.4 –1.13E-5 –0.04 –16.4 –23 –1.64 

CONC 01614500 CONOCOCHEAGUE CREEK AT FAIRVIEW, MD 2003 –0.012 –12.9 –0.001 –1.29 –65.8 –23.1 –6.58 

ANTS 01619500 ANTIETAM CREEK NEAR SHARPSBURG, MD 2003 –0.010 –8.1 –0.001 –0.81 11.3 9.1 1.13 

SOUT 01626000 SOUTH RIVER NEAR WAYNESBORO, VA 2003 –0.002 –5.4 –0.000 –0.54 2.34 17 0.234 

SFSL 01628500 S F SHENANDOAH RIVER NEAR LYNNWOOD, VA 2003 –0.029 –29.4 –0.003 –2.94 –70.8 –19.2 –7.08 

SFSF 01631000 S F SHENANDOAH RIVER AT FRONT ROYAL, VA 2003 –0.030 –34 –0.003 –3.4 81.4 12.6 8.14 

NFSH 01634000 N F SHENANDOAH RIVER NEAR STRASBURG, VA 2003 –0.101 –66.8 –0.010 –6.68 –182 –44.9 –18.2 

CATM 01637500 CATOCTIN CREEK NEAR MIDDLETOWN, MD 2003 –0.039 –37.3 –0.004 –3.73 –18.4 –37.7 –1.84 

CATT 01638480 CATOCTIN CREEK NEAR TAYLORSTOWN, VA 2003 0.015 35.9 0.002 3.59 11.5 54.5 1.15 

MONO 01639000 MONOCACY RIVER AT BRIDGEPORT, MD 2003 –0.002 –1.3 –0.000 –0.13 14.8 11.2 1.48 

POTC 01646580 POTOMAC RIVER AT CHAIN BRIDGE, AT 

WASHINGTON, DC

2003 0.006 9 0.001 0.9 361 8.6 36.1 

ACCO 01654000 ACCOTINK CREEK NEAR ANNANDALE, VA 2003 –0.002 –3 –0.000 –0.3 2.01 13.8 0.201 

RPHR 01664000 RAPPAHANNOCK RIVER AT REMINGTON, VA 2003 0.000 1 3.28E-5 0.1 11.8 11.9 1.18 

RPDR 01665500 RAPIDAN RIVER NEAR RUCKERSVILLE, VA 2003 –0.009 –24.5 –0.001 –2.45 –5.27 –25.8 –0.527 

RPHF 01668000 RAPPAHANNOCK RIVER NEAR 

FREDERICKSBURG, VA

2003 0.028 47.2 0.003 4.72 458 61 45.8 
Table 2-5. Ten-year trends in total phosphorus, through water year 2012.—Continued

[POR, period of record; mg/L, milligrams per liter; kg day–1, kilograms per day; kg day–1 km–2, kilograms per day per square kilometer; E, estimated]

Station 

abbreviation Station ID Station name Start year

Trends in concentration Trends in flux 

POR Per year POR Per 

mg/L percent mg/L percent kg day–1 percent kg day–1 

NANN 01671020 NORTH ANNA RIVER AT HART CORNER NEAR 

DOSWELL, VA

2003 0.005 21.3 0.001 2.13 12.7 29.4 1.27 

LITT 01671100 LITTLE RIVER NEAR DOSWELL, VA 2003 0.017 45.9 0.002 4.59 4.48 36.8 0.448 

PAMU 01673000 PAMUNKEY RIVER NEAR HANOVER, VA 2003 –0.006 –6.6 –0.001 –0.66 42.7 20.1 4.27 

PORV 01673800 PO RIVER NEAR SPOTSYLVANIA, VA 2003 –0.001 –2.8 –0.000 –0.28 0.262 2.5 0.026 

MABG 01674000 MATTAPONI RIVER NEAR BOWLING GREEN, VA 2003 –0.001 –3.1 –0.000 –0.31 0.508 1.7 0.051 

MABU 01674500 MATTAPONI RIVER NEAR BEULAHVILLE, VA 2003 0.008 15.6 0.001 1.56 13.8 19.3 1.38 

MECH 02031000 MECHUMS RIVER NEAR WHITE HALL, VA 2003 0.032 85.9 0.003 8.59 43.2 140.6 4.32 

JAMC 02035000 JAMES RIVER AT CARTERSVILLE, VA 2003 –0.001 –1.4 –0.000 –0.14 1,410 64.8 141 

JAMR 02037500 JAMES RIVER NEAR RICHMOND, VA 2003 0.003 4.7 0.000 0.47 638 25.7 63.8 

APPF 02039500 APPOMATTOX RIVER AT FARMVILLE, VA 2003 0.019 65.8 0.002 6.58 48.1 94.5 4.81 

DEEP 02041000 DEEP CREEK NEAR MANNBORO, VA 2003 0.014 28.7 0.001 2.87 7.37 25.3 0.737 

APPM 02041650 APPOMATTOX RIVER AT MATOACA, VA 2003 0.003 6.8 0.000 0.68 11.3 6.7 1.13 

CHIC 02042500 CHICKAHOMINY RIVER NEAR PROVIDENCE 

FORGE, VA

2003 –0.024 –23.2 –0.002 –2.32 –28.7 –28.8 –2.87 
Table 2-6. Ten-year trends in sediment, through water year 2012.

[POR, period of record; mg/L, milligrams per liter; kg day–1, kilograms per day; kg day–1 km–2, kilograms per day per square kilometer; SSC, suspended-sediment concentration; 

Station 

abbreviation Station ID Station name Start year Con- stitu- ent

Trends in concentration Trends in flux 

POR Per year POR 

mg/L percent mg/L percent kg day–1 percent kg da

CHOP 01491000 CHOPTANK RIVER NEAR GREENSBORO, MD 2003 SSC 4.46 72.8 0.446 7.28 3,990 65.8 3

SRTW 01531500 SUSQUEHANNA RIVER AT TOWANDA, PA 2003 SSC –1.47 –4.9 –0.147 –0.49 –339,000 –12.1 –33,9

SRDA 01540500 SUSQUEHANNA RIVER AT DANVILLE, PA 2003 SSC –0.588 –1.8 –0.059 –0.18 –174,000 –3.6 –17,4

WBSL 01553500 WEST BRANCH SUSQUEHANNA RIVER AT 

LEWISBURG, PA

2003 SSC –5.44 –29.5 –0.544 –2.95 –594,000 –38.3 –59,4

JUNI 01567000 JUNIATA RIVER AT NEWPORT, PA 2003 SSC –7.24 –34.4 –0.724 –3.44 –460,000 –55 –46,0

SRMA 01576000 SUSQUEHANNA RIVER AT MARIETTA, PA 2003 SSC –4.19 –13 –0.419 –1.3 –3,360,000 –32 –336,0

CONE 01576754 CONESTOGA RIVER AT CONESTOGA, PA 2003 SSC –4.36 –10.7 –0.436 –1.07 –98,100 –32.4 –9,

SRCW 01578310 SUSQUEHANNA RIVER AT CONOWINGO, MD 2003 SSC 5.12 29 0.512 2.9 1,540,000 16.3 154,0

GUNP 01582500 GUNPOWDER FALLS AT GLENCOE, MD 2003 TSS 21.7 186 2.17 18.6 23,200 96.8 2,3

NBPA 01586000 NORTH BRANCH PATAPSCO RIVER AT 

CEDARHURST, MD

2003 TSS 22.1 190.3 2.21 19 13,500 127.2 1,3

GWYN 01589300 GWYNNS FALLS AT VILLA NOVA, MD 2003 TSS 17.6 225.7 1.76 22.6 17,000 285 1,7

PAXU 01591000 PATUXENT RIVER NEAR UNITY, MD 2003 TSS 38.4 263.9 3.84 26.4 34,600 269.1 3,4

PAXB 01594440 PATUXENT RIVER AT BOWIE, MD 2003 SSC 16.8 59.4 1.68 5.94 35,600 57.5 3,5

GEOR 01599000 GEORGES CREEK AT FRANKLIN, MD 2003 TSS 34.1 142.9 3.41 14.3 28,700 246.6 2,

WILL 01601500 WILLS CREEK NEAR CUMBERLAND, MD 2003 TSS 10 49.4 1 4.94 85,000 108.4 8,

CONC 01614500 CONOCOCHEAGUE CREEK AT FAIRVIEW, MD 2003 TSS 7.04 35.8 0.704 3.58 56,100 52.2 5,6

ANTS 01619500 ANTIETAM CREEK NEAR SHARPSBURG, MD 2003 TSS 14.5 89.6 1.45 8.96 31,500 96.6 3,

SOUT 01626000 SOUTH RIVER NEAR WAYNESBORO, VA 2003 TSS –0.557 –8.6 –0.056 –0.86 1,540 20.7 

SFSL 01628500 S.F. SHENANDOAH RIVER NEAR LYNNWOOD, VA 2003 TSS 12.2 65.4 1.22 6.54 384,000 91 38,4

SFSF 01631000 S F SHENANDOAH RIVER AT FRONT ROYAL, VA 2003 SSC 7.77 40.1 0.777 4.01 478,000 116.2 47,

NFSH 01634000 N F SHENANDOAH RIVER NEAR STRASBURG, VA 2003 SSC 11.5 76.7 1.15 7.67 101,000 54.6 10,

CATM 01637500 CATOCTIN CREEK NEAR MIDDLETOWN, MD 2003 TSS 0.363 1.4 0.036 0.14 –18,900 –30.5 –1,

CATT 01638480 CATOCTIN CREEK NEAR TAYLORSTOWN, VA 2003 TSS 5.45 71.6 0.545 7.16 9,730 82.7 9

MONO 01639000 MONOCACY RIVER AT BRIDGEPORT, MD 2003 TSS 3.51 29.8 0.351 2.98 19,600 56.8 1,9

POTC 01646580 POTOMAC RIVER AT CHAIN BRIDGE, AT 

WASHINGTON, DC

2003 SSC 7.68 29.8 0.768 2.98 173,000 4.9 17,3
Table 2-6. Ten-year trends in sediment, through water year 2012.—Continued

[POR, period of record; mg/L, milligrams per liter; kg day–1, kilograms per day; kg day–1 km–2, kilograms per day per square kilometer; SSC, suspended-sediment concentration; 

Station 

abbreviation Station ID Station name Start year Con- stitu- ent

Trends in concentration Trends in flux 

POR Per year POR 

mg/L percent mg/L percent kg day–1 percent kg da

ACCO 01654000 ACCOTINK CREEK NEAR ANNANDALE, VA 2003 TSS –7.47 –28.8 –0.747 –2.88 –3,070 –17 –3

RPHR 01664000 RAPPAHANNOCK RIVER AT REMINGTON, VA 2003 TSS 2.82 22.9 0.282 2.29 30,600 26.5 3,0

RPHF 01668000 RAPPAHANNOCK RIVER NEAR FREDERICKSBURG, VA 2003 SSC 11.3 35.8 1.13 3.58 185,000 26.3 18,

NANN 01671020 NORTH ANNA RIVER AT HART CORNER NEAR 

DOSWELL, VA

2003 TSS 3.06 32.4 0.306 3.24 11,000 34.3 1,

RPHF 01671100 LITTLE RIVER NEAR DOSWELL, VA 2003 TSS 6.64 126.5 0.664 12.6 1,110 29.7 

NANN 01673000 PAMUNKEY RIVER NEAR HANOVER, VA 2003 SSC 18.2 86.7 1.82 8.67 73,000 70 7,3

MABU 01674500 MATTAPONI RIVER NEAR BEULAHVILLE, VA 2003 SSC 0.053 0.5 0.005 0.05 –2,880 –12.5 –2

MECH 02031000 MECHUMS RIVER NEAR WHITE HALL, VA 2003 TSS 15.3 132.9 1.53 13.3 35,600 125.6 3,

JAMC 02035000 JAMES RIVER AT CARTERSVILLE, VA 2003 SSC 15.7 58.6 1.57 5.86 958,000 55.3 95,

JAMR 02037500 JAMES RIVER NEAR RICHMOND, VA 2003 TSS 12.2 64.5 1.22 6.45 785,000 62.8 78,

APPF 02039500 APPOMATTOX RIVER AT FARMVILLE, VA 2003 TSS 27.2 241.3 2.72 24.1 138,000 261.3 13,

DEEP 02041000 DEEP CREEK NEAR MANNBORO, VA 2003 TSS 3.22 50.5 0.322 5.05 4,090 45.4 4

APPM 02041650 APPOMATTOX RIVER AT MATOACA, VA 2003 SSC 2.38 31.6 0.238 3.16 5,630 11.4 5

CHIC 02042500 CHICKAHOMINY RIVER NEAR PROVIDENCE 

FORGE, VA

2003 TSS 1.4 18.3 0.14 1.83 –1,770 –12.6 –