TIDAL ADJUSTMENT TABLE

The predictions given in the monthly tables are for the OSU Hatfield Marine Science Center Dock in South Beach, Yaquina Bay. Tides for locations north of South Beach generally occur later (add time) and tides for locations south of South Beach generally occur earlier (subtract) than the tides given in the tables. Corrections for tidal heights are now given in ratios.

The times of high/low water up river or up bay occur later than the times at the harbor entrance. 

Location	High Min	Low Min	High Ratio	Low Ratio
Seaside, 12th Ave. Br., Necanicum R.	6	93	0.67	0.34
Nehalem River, Nehalem	36	82	0.84	0.68
Tillamook Bay
Barview	1	22	0.88	0.84
Garibaldi	38	37	0.97	0.96
Nestucca Bay, Entrance	14	38	0.89	0.84
Siletz Bay
Taft	7	39	0.76	0.68
Kernville	43	79	0.70	0.61
Yaquina Bay
South Beach	0	0	1	1
Yaquina	14	21	0.97	1.00
Toledo	48	65	0.95	0.84
Alsea Bay, Waldport	15	27	0.90	0.91
Siuslaw River
Entrance	-12	-1	0.86	0.91
Florence	38	54	0.77	0.75
Umpqua River
Entrance	-1	-1	0.81	0.91
Reedsport	65	80	0.79	0.75
Coos Bay
Charleston	-11	-4	0.89	0.91
Coos Bay	80	84	0.86	0.84
Bandon, Coquille River	-18	-6	0.81	0.84
Port Orford	-28	-23	0.86	0.99
Wedderburn, Rogue River	-32	-18	0.77	0.84
Brookings, Chetco Cove	-40	-30	0.81	0.91

Adjustments
To estimate the high tide for a particular location, add the high minutes to the South Beach predicted high time from the monthly table. If the time is negative, subtract the indicated number of minutes. To estimate the low tide for a particular location, add the low minutes to the South Beach low time. To find the estimated tidal height, multiply the South Beach predicted high height by the indicated high ratio and the South Beach low height by the indicated low ratio.

Example
The find the estimated high tide at Taft, add 7 minutes to the South Beach time and multiply the predicted high tide height by the ratio of 0.76. To find the estimated low tide at Taft, add 39 minutes to the South Beach time and multiply the predicted low tide by the ratio of 0.68.