I'm assuming you're speaking of AC crew. My discussions have been mostly with UA or UAX crew.

Indeed.

First time doing a land crossing tomorrow.

Do I have to complete a TDC - traveller declaration card -- if I have nothing to declare, i.e. I'm not bringing anything into Canada, other than my personal effects?

Nope - not needed.

The only thing you can acquire and not declare is fuel for your vehicle.

What to do at each Niagara crossing
 

If you are using the Whirlpool Bridge and entering Canada, you have to park and go to the little house on the right before getting on the bridge on the US side, and put your card on the stand and feed money into the machine. Then you use your NEXUS card to pay the toll.
When you use a NEXUS line to enter Canada, even if you have your card and hold it up and have nothing to declare, you must stop at the inspector until you are cleared.
If you use the Lewiston-Queenston Bridge there is no NEXUS line but your toll money in the NEXUS card is usable.
If you use the Rainbow Bridge, there is a NEXUS line and the toll can be paid with the NEXUS money.
If you use the Peace Bridge, there is a NEXUS line but the NEXUS money is not accepted.
If you are entering the US via a NEXUS line, you stop and make a verbal declaration - a much easier system.
You are also subject to random searches, no matter what you declare. Bring a passport.

Can I still use my nexus card now that I am newly landed immigrant to Canada and do I need to update anything except for my address. Also wondering while waiting on my PR card to arrive can I travel back from the US just using my Nexus card. Don't want to jeopardize my PR status if I am dong something wrong.

Why no NEXUS option for APIS data?
 

Don't know if this has been answered yet:

When traveling to certain countries, AC requires you to provide advance passenger information during OLCI.

Why is NEXUS not one of the accepted IDs? So far, the website only accepts a passport number. (Specifically, I refer to travel between Canada and the US.)

Likely because depending on the country, they have no knowledge of, nor do they give a rat's ... about NEXUS ... I know if I was in the EU I sure would not! :p

Why support a form that is only accepted for 2 countries - as opposed to one accepted by all. Doubt that an EU country would have access to the Nexus database for corroboration. :D

Also, more recently, noticeably in the last year or so, I have had trouble using my Nexus as ID when checking in with AC agents, particularly at EWR, as they seem to want passports. US airline's have pretty much always been this way, as most don't really know about Nexus. But where in the past I haven't had trouble with AC, I have been more recently. Not to mention, the check in kiosk's, both US-based carriers, and one's like at YYZ can't seem to read the coding on Nexus cards, even though it seems to be just like those on passports. I figure, though, it doesn't make much of a difference to me, as really, you have to have your passport with you anyway.

On the other hand, ironically Porter does (or at least used to) allow you to use a Nexus number when inputting your info. online, even though you can't use Nexus when traveling with them, as you can't preclear US customs, and there is no Nexus machine at YTZ. Go Figure!

Thats what I've found. I just go ahead and scan my passport and show it to them at the gate. Even at YYZ, I've found some gate agents that demand to see a passport.

You're required to carry it anyways, so I just show it.

I make a point of using only my NEXUS card anywhere in the US, be it at check in or security. It is, after all, one of the accepted forms of identification. More ranting about that in the TS&S forum, however.

Funny thing is, while I've had all the trouble with airline personal accepting them, I've noticed now that security, when I show it there, for the most part seems to realize this is an accepted form of ID now.

So, if you make a point of using it in the US at check-in, how do you use it? From my experience, as I mentioned previously, machines won't read Nexus cards - and agents won't accept them either. So how do you get the machines to see it. And how do you convince the agents to accept? And furthermore, is it really worth the trouble. Since really, you need to have your passport with you anyway, isn't convincing them to accept it more trouble than its worth?

Nexus Interview and couple other questions
 

Hello,

I have been "conditionally approved" does this mean I'm pretty much getting a Nexus card? I'm assuming at this point I've passed all the back ground checks and all the information on my application have been confirmed?

As for the Nexus interview, what types of questions do they ask? Do they grill you?

Also, another random question, just incase someone is able to answer it. I am up in Canada visiting my husband a couple months at a time and I was told that you are allowed to stay in Canada as a US citizen 6 months at a time, and as long as I went back to the US for a bit and came back that would okay. So I've been going back to the US every couple of months. But now I'm reading on some websites that it's a maximum of 6 months within a calendar year.

Thank you for your help.

You've been conditionally approved. It's just that, conditional subject to your in-person interview.

When you go in you'll be asked "Why do you want a Nexus Card?"

All of your documentatoin will be verified and scanned into thier system. In addition, your fingerprints will be taken and run through various databases. If everything checks out and the officer is satisfied you are a 'trusted traveller' then you will receive full approval. Your photo will be taken and your card will be sent by mail and you will have it in 7-10 days.

Now, not wanting to get personal but since you brought it up... what is your husband's status in Canada? Is he a Canadian citizen or a US citizen in Canada on a work visa?

There was a case on the news recently about a woman who was frequently crossing the border to 'visit' her husband. The last time she was referred to secondary and refused entry as immigration felt she was intending to live and not return to her home. Of course, YMMV.